Much as everyone's bitter about this, I agree with the suggestion. [I can also prove Allen did abuse the mount, heh.]
I myself remember how annoying was it that everyone just ran away from me in PvP when they were losing (being a pre-update Knight with nothing to prevent them from doing so) and vice-versa, chasing me effortlessly when winning, but that's not really the point...point is, this directly interferes with - and destroys - the PvP metagame.
Why ever use classes' escape mechanisms when you can x2 speed and effortlessly retreat? Why chasing retreating people knowing you cannot stop them from doing this, not even with dismount abilities? If we're talking about class abilities - for Zerks, why saving up cooldowns to chase/retreat? etc, etc.
Contrary to cie wie's opinion - it's not about who hasn't/has the mount, it's about the mount itself destroys the meta, eliminating the need to care about your M.Spd (which is a major stat PvP-wise). It doesn't get better when everyone has these mounts - the people are still NOT equal in chances, as some classes (Zerks, Sorcs, Snipers) benefit from M.Spd much greater than others. There is still an imbalance.
inb4 comments: anything not directed at the topic itself [e.g. "if you don't have it, stfu"] will be ignored, as will be "just no"-esque comments.
Props to Allen.