I like the idea of splitting up big things to smaller parts and I know that this works fine when done right. Doing hosting myself for almost two decades now, I know that this is absolutely feasible.
This reminds me of the times in the dotcom bubble where my role usually was to replace/stand by some big insanely expensive Sun servers with a few of cheap independent Linux boxes (and also phase out bloaty java enterprise crap for lean modern codebases).