It's up to Turbine to decide whether it's a problem that more people are running on elite. That trend started long before warlock with the very first balance pass. That was the whole reason they started doing the pass was to bring weaker builds in line with top builds. The average player may do better with warlock than other builds - although there are many strong builds.
I think game breaking builds can only be assessed when comparing characters at level cap with optimal gear, past lifes, etc. We can agree to disagree on that one.