Yeah, people said this when they nerfed dodge, too. Along with many other nerfs.
We're talking about level 19 rogues here. Putting DR on dodge wasn't game breaking for rogues because even though they weren't invincible in a melee fight anymore, they still had a ton of tools that made them good.
With Cata, they gained Shadow Step, 6 sec CD on stealth, and increased speed while stealthed.
Right now, rogues depend on Gouge, Sprint, Shadow Step, and Waylay as tools to maintain ToT and control the fight. Losing every single one of those tools turns them into a One-Hit-Wonder out of stealth, and if they can't score a kill right away, they are going to get shit on.
Those are simple facts, and the reason why there's been so much discussion surrounding rogues going into this expansion. If you want an accurate perception of rogues in MoP, just look at Warriors now, and add a stealth button.
I mean seriously, do you think the OP would be looking to trade his rogue if they had a bright future?