Well, I'll always be here for support reasons.
I'm not really a fan of the whole "oh RMVX, it's the newest thing, let's get it!" I waited about 2 years before getting RMXP and I've learned alot already, I'm not gonna waste my time with a new thing and start all over. If you've made a lot of progress with RMXP I say stick with it instead of bumping up right away, if you move to RMVX there will be more time wasted to fix up the game so it works with that! It's better off just keeping the project and not converting it, you've already got everything working the way you want it to so why start again?
You've already got a team, you've already got resources, you've already started to develope a full blown game, you shouldn't have to start all over, it's better to stick with what you're familar with and keep everything than go to something new and "better" and lose everything. Don't change please, this game is potential to prove that just because RMXP is becoming "out of it's league" doesn't mean that it isn't good anymore.