I actually hate Brock mostly because of his girl hunting moments. I don't think, in the first place, such things should be in kids show (and be honest, Pokémon is a kids show). Other then that, he could be interesting character, but wrtiters goes definitely wrong way with him. IMHO even Max were more interesting character then Brock. So, I wish Brock never were in Pokémon anime in the first place.
But, what I am more affraid then Brock's fate is Dawn's fate. I really do not want to getting used for third main girl. That would be really annoying for me. So, what I want for 5th gen is, Ash and Dawn stay and new male character from games replaced Brock as a sidekick. Since he only will be sidekick, they can freely replace him by new gen 6 character. But changing main character after we finally used to her will not be fair just like it were not with May.
But, what I am more affraid then Brock's fate is Dawn's fate. I really do not want to getting used for third main girl. That would be really annoying for me. So, what I want for 5th gen is, Ash and Dawn stay and new male character from games replaced Brock as a sidekick. Since he only will be sidekick, they can freely replace him by new gen 6 character. But changing main character after we finally used to her will not be fair just like it were not with May.