Time to roll a squad of male gnome rogues with pink hair and put them into a guild called <Gaylord FoKer And Poising Friends>

If this goes live without changing the rogue class, or at least the poisons mechanics any rogue will be able to obliterate a full raid of healers/casters by just using slow casting poison and spamming FoK.

Also some old raid encounters will become next to impossible unless they change them. Chromagus in BWL is a great example about why you need cleansing totems.

Make the dispell cost similar to casting any other spell. Also make it ro be resistable based on the bad spell caster resilience, hit rating or whatever other option... and problem solved without changing completely the game mechanic.