The shortening and nerfing of many encounters will result in a net dps loss. As your raid dps increases and the health of your targets decreases, things like total time spent during execute range, total time damaging zonozz with debuffs and total damage done to aoe mobs will decrease. This can result in lower dps with the same execution and performance. However, at a certain point and on certain encounters this balances out from increased uptime on heroism and potions. But nonetheless, I think the net result is still that, gear improvements aside, our total damage potential decreases as our raids become stronger and our targets lose helAth.