Summary: You don't need to hire sysadmins because you can outsource your systems to a cloud provider.
This is true, but it's also a lot like saying you don't need to hire developers because you can outsource your development to Lithuania. Really what it means is that it's possible to outsource systems. If you're the little guy and your needs manage to mesh well with what you can get off the shelf from a cloud provider, this is true. Otherwise, this isn't true. If you're the little guy and your needs don't exactly fit what you can get off the shelf, it's going to be trickier. If you're the big guy, you can afford to cut out the middleman.
This is true, but it's also a lot like saying you don't need to hire developers because you can outsource your development to Lithuania. Really what it means is that it's possible to outsource systems. If you're the little guy and your needs manage to mesh well with what you can get off the shelf from a cloud provider, this is true. Otherwise, this isn't true. If you're the little guy and your needs don't exactly fit what you can get off the shelf, it's going to be trickier. If you're the big guy, you can afford to cut out the middleman.