As a mage I agree. Mage portals create a vast efficiency advantage over every single class and should be removed or nerfed.
Druid travel forms also create a drastic advantage, can be used to harvest nodes, and are far faster than soar and must be subsequently nerfed or removed.
Vulperas second hearthstone is also ridiculously overpowered and should be outright removed or given a 3 hour cooldown at minimum.
If soar gets nerfed for letting Dracthyr move across an empty zone slightly faster than on foot there is no logical reason why these other races and classes should be allowed to keep their far superior forms of transport.