You wouldn't want Rareware going third party and developing for all systems, and here's why:
Their delays. Much as you hate them, they do improve the games. And to produce the top notch quality games that Rareware does, they need a lot of time. And they won't have that time if they go third party. Their last home console game was Conker's Bad Fur Day which was released around this time last year if I remember correctly. Their next game will be Star Fox Adventures to be released in September, at least a year and a few months after their last game, even if I'm incorrect on CBFD's launch date. Third parties can't survive on one game a year. Even if we take into account the GBA games Rareware is producing (and I don't know what the launch dates are for their GBA games), I highly doubt that they would be able to support all 200 members of the company.
So if Rareware goes third party, they will probably lay off several employees and produce games faster without taking the time to tweak everything to perfection. The result is a decrease in the quality of their games. There's no telling how much their game quality would drop, but I think it's safe to say that they wouldn't be quite the same Rareware.
The only reason they are allowed to take so long on their games is their relationship with Nintendo. The pattern is similar with other second parties. Look at how long it's taking for Silicon Knights, Retro and Bungie (Halo took 2 years) to make a single game. This way of doing business wouldn't work in the third party world. But so far, I think it's safe to say that it produces results.
Truthfully, if Bungie were a third party and Halo was a poorer game as a result of the smaller development time, I wouldn't see it as a plus that Halo is coming to GameCube. The way things are now, I can at least find some friend who owns an Xbox and borrow his if I really want to play Halo so badly.
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