If expertise becomes completely linear, there would never be a reason to use any pve crap ever which is one good thing. This would indirectly result in slightly higher TTK which people do want.
I was referring more to people who enter WZ's with 300 expertise simply because they don't know any better or are just a PvE'er trying to farm something they need for PvE.
Personally... I think a higher TTK is a bad thing for rated. People want it... but most of those people are only playing in regs. All we can do is wait until it's released to see how much it really affects game play.