Jedi Knight sold very well. 6th best for PC that year I believe. This is not the reason it was never ported. I think maybe it landed in a weird pocket, console wise, where the existing consoles perhaps couldn't run it? Just a guess.
LucasArts is never going to invest time and money into revamping a ten year old game. Believe me when I say that I'd be the first in line to buy it though. Would they ever possibly remake it entirely? Parhaps but I wouldn't count on it.