Wow. That sounds pretty damn useful for JSPWiki and beyond. I shared Murray's concern about total dependence on JCR too, but if a light-weight file-based JCR implementation is feasible, that definitely changes my thinking.
Yes, it is very feasible - as long as you don't try to shoot for total JSR-170 compliance. Some things, like XPath queries or SQL queries can be a bit too complicated, though. But if we keep the feature set that we need relatively clean, and upgrade gradually, then I think it all should work just nicely.
/Janne
