To everyone against this lore wise...
Your the dragonborn. If anybody could force a dragon to let them ride it would be your character.
Spoiler ^^^ Read above spoilers for proof of that.
I also like the Elder scrolls take on dragons as very intelligent immortal beings. But that just makes it more epic to be able to control one to that level. Being intelligent beings who says that
Spoiler you and ohdahviing don't end up being friends in the long run?
From a technical standpoint however:
I can see this being done on the pc with mods (heck its already been done) but on the xbox/ps3 they would have to completely redo the way cities are done or you would see a big gaping hole below you where the city interior should be. This makes me believe bethesda will not do this on consoles bar
Spoiler the 2 second ride on ohdaving