You have better ways to ask for explanations. Not the OP but I can give some reasons for Javascript and Node.js to not be the best option for a rewrite if the goal is longterm maintainability:
- js / node.js is very young, it might fade out of fashion, and in 10 years it is not impossible that good coders in js will be hard to find.
- Readability and simplicity are prominent in this context, and js has a syntax that is less than optimal in this regard.
- Maintenance tooling may be lacking.
If I were to choose a language for a project that I new will be big and will need care in 10 or 20 years, I'd hesitate, and maybe choose Java (which I hate) or Python (which I hate less). If in a risk-things mood, I'd give Go a try.
Technology and business requirements move too fast to worry about writing software that will be around 10 years from now. Choosing the best technology for your particular use case, that will also allow your software to evolve over time, is much more important than trying to predict the future.
Also, I've gotta say, you completely undermined all 3 points of your argument by saying you'd choose Go.
> Technology and business requirements move too fast to worry about writing software that will be around 10 years from now
This is a common belief but I do not think it applies very well in most cases. If you write the last pic sharing thing, maybe you can dismiss worries, but if you build the next Google, entreprise or scientific software, or even something like Github, you should hope your baby to be well and alive in 10 years, and choose your tech stack accordingly. I guess.
Google in 2002 was nothing like Google in 2012. The only thing the same is the name. The entire software industry has changed at least twice in the last decade or so. If more than 10% of the original code that powered Google is still in production, I would be absolutely shocked.
Remember how Twitter was originally written in Rails, and then it collapsed under its own weight when they tried to scale it? Their business requirements changed, so they rewrote the parts that needed to be rewritten. On the flip side, if they had originally set out to try to build the system that now powers Twitter, not only would they likely have built the wrong thing entirely, they never would have launched.
Software services are evolutionary. You have to always be willing to burn pieces of it down and rewrite them as conditions change around you.
Sure, but changing the tech stack is much harder than rewriting some parts of it. And some setups are easier to adapt than others. Thus choosing the best available option when starting a new project is important, and the likeliness of the technology to be alive and well in ten years should be taken into consideration, among other parameters (your own experience, the current availability of good developers).
Moreover, the "trendiness" of a technology should be counted as a negative factor, because it would tend to be overestimated and cast shadows on potentially better (but less sexy) alternatives.
I don't see how finding JavaScript programmers is going to be a problem in 10 years... even if they started now it would take, at least, that long to fully deprecate the language out of the browser. NodeJS may go away but I think betting on JavaScript going away are some pretty long odds.
Node.js may be young but 98% of the code can be reused (and if you are careful, you probably wrote the fallbacks already). V8 can be built separately.
When you understand the zen of javascript and try to write in a consistent manner, JS is more readable than C. I equate these concerns with arguments about how lisp or scheme is unreadable.
The ecosystem for tooling is expanding, albeit slowly.
However, most of your code probably could be implemented in a way that can be run in browser (e.g. XLS parser: http://niggler.github.com/js-xls/) which is where I see the real value in node. Aligning the languages means fewer moving parts and potential points of failure (as opposed to having to worry about quirks in implementations of many languages and worrying about features supported in one context but not the other)
- js / node.js is very young, it might fade out of fashion, and in 10 years it is not impossible that good coders in js will be hard to find.
- Readability and simplicity are prominent in this context, and js has a syntax that is less than optimal in this regard.
- Maintenance tooling may be lacking.
If I were to choose a language for a project that I new will be big and will need care in 10 or 20 years, I'd hesitate, and maybe choose Java (which I hate) or Python (which I hate less). If in a risk-things mood, I'd give Go a try.