Treyarch is taking every suggestion into account. I understand they want a fresh game, but as to how the plethora of new features is implemented is going to make or break Black Ops. If it's implemented poorly, it'll be like MW2- fine at the start but on a steep slope to hell.
If it's implemented correctly, we might have the most fun game in the series so far.
MW2 was one of the worst shooters I've ever played, so I'm just going to give Black Ops the benefit of the doubt and assume it's leagues better than MW2.