That's just because we're at the tail-end of an expansion and everybody has tons of rental abilities and secondary stats. When SL launches everything will be super slow again, until the end of that expansion when it won't.
That said, Hunter's Mark has nothing to do with how fast the class plays. It's just an extra GCD to toss in the mix, and unfortunately it's a button that many hunters don't find fun to press.
I agree that it won't be taken off the GCD. Zero chance. I put that in the poll because it's what a lot of people want.