I thought the EVO should never evolve away from anything but the 4g63, but it did. So I think it would be ok for an RX to be non-rotary.
I think they would at least need to make the rotary more economical.
It sucks down fuel worse than some v8's, chugs oil like no other, and if you are rotary-illiterate and try using synthetic oil in it, you blow it up.
But the worst is the whole flooding issue. Even the new rx8's did it! I don't know about anyone else, but I don't want to own a new car that sometimes starts and sometimes doesn't.
So I think if I really want a high revving engine, I'll buy a Honda ;p