TI RPG 3? Well that would be an interesting idea. I still would love to continue improvements on 2, doing stuff along the lines of the current upcoming update, but I may sometime go and make big enough changes to deserve a new game. And yes, I too would really love to see this conversion in its entirety. I really enjoy seeing all the things that would just not be possible with the Basic framework. I've done what I can with it, but in the end, its not exactly designed for programming games.
And no, probably not any time soon. That would require learning Lua, and I'm backed up as it is with Ti RPG 2, the flash game I'm working on, and Source Filmmaker, not to mention college applications.
But once all these things settle down, I certainly wouldn't consider it an impossibility.