Don't get me wrong, I would love it if it were to ever happen, I'd snap that up immediately, but a 13 year old game for a toyline that has been dead for nearly all of those 13 years...? Yeah, not likely. Not to mention the hassle of trying to port it to newer operating systems, which I doubt Lego is paying TT Games enough for anyone there to do or even care about doing.
And yes, old games get re-released all the time, but those are for franchises that have WAY more interest in the wider gaming community. We just have to accept that no old Bionicle games will see that same sort of treatment, no matter how much we would like it.