I think Gundam can survive and even grow from different takes of the series. There's a lot of cool stuff to choose from
Bebop was a bit of a "lightning in the bottle" and not a lot of varied backgrounds to take from. So a new or different take on anything from its history will be very noticeable.
It's like when one of the latest TMNTs made Raph the leader. It was weird but there's enough other Turtle stuff out there, it wasn't a big deal in the scheme of things. Some people don't even know that happened and it didn't even put a dent in the franchise.
With Bebop, if you make a minor change, it is palpable because there's only the anime and the short-live manga to turn to for alternatives.
That being said, I enjoyed the live action. A Lot.