First, it would support current functionality, so you wouldn't lose anything. So everything that it adds is a net gain.
Second and biggest benefit, I believe it would allow them to add features more easily because they'd easily be able to build a simple and well structured Nulis DSL in Tree Notation that removes a lot of the incidental complexity of their current code.
Third, it would make their "nls" files human readable and writeable. No more quotes or brackets, et cetera. With a few tweaks to their current implementation, folks could then drop in more file structures that can then be visualized and edited in nls.
