On the subject of flying mounts , my argument against them (while agreeing with the whole world/skipping content problems ), is that the sheer amount of effort to do it is not worth it.
Basically there are always things , be it new zones , dungeons , mobs , races , classes and so on that add to the game , not causing potential problems of making the world "smaller" as flying would do , that should be done before time and money is spent on any sort of flight system.
And to the person asking why should we trust Brad now ? My answer is Brad made/participated in my favorite game of all time , EQ , and Vanguard to this day still came the closest to EQ for me. I'm hoping lessons he learned from the VG downfall will help this time around. Finally , and importantly ,look at all the shovelware , story mode , instanced everything , no real classes but ACTION ACTION ACTION combat , pseudo mmo's that have been released over the past several years. Why not trust Brad can do better for me and my niche than any of the current folks ?