5G is very unlikely to satisfy everyone. It's actually far more likely to create further fandom divisions, which we don't need.
The classic versions don't have to go anywhere. An expansive take on the Satellite era/JLU inspired take on the team could allow a lot more diverse characters to be brought in in addition to them. The main problem, as someone else said, is the decompression and modern writing style which means characters would either be reduced to cameos or one set of them would get focus for an arc that would take 2-5 months to tell, if not more, forcing everyone else to wait. While the writers back then weren't as equipped to deal with more diverse characters, the writing style that allowed a satisfying one-shot issue with one group of characters that could be rotated out for a new one the following issue was actually better for this type of thing.