So a cool new technology requires a massive rewrite? Hmm.... sounds kinda like Microsoft.
Notes 8.5.1 will get XPage support in the Notes client. This may mean we finally have a single dev road where we can simply write an app in XPages and it Just Works(tm) in browser or client. And that would be really, really fantastic. But (as far as I know) Xpages still aren't going to support LotusScript. So, again, any legacy apps will need major rewrites to take advantage of the new front-end.
It'd be great to see LotusScript support in XPages - at least basic WQO/WQS equivalent functionality.
More discussion on my blog: