I think the people that hated GI were just really, really vocal about it. People act like everyone hated them, but it wasn't true at all. A lot of people loved them, & a big part of the fanbase was open to them & were willing to see where it went.
I think part of the problem back then was that the writers weren't sure back then how far they could push the audience. Now, they'll break up any couple & kill of anyone