The Druids ability to go instant flight is fairly unique to them, and it is probably OK to stay that way. While it would be nice to have an ability to go instantly from glide to full flight, I would say for dracthyr it would need to be a cool down ability. With other classes available now it might be too easy to abuse otherwise, even if it would be epic and I’d do it all the time!
I feel like the big changes that need to be made to Soar to make it truly viable is to treat it just like a flying mount, kinda like worgans Running Wild is a ground mount. Normal cast on ground, no cooldown (because dracthyr are terrible gatherers with that), and it has an ‘on the ground’ version that uses the hover animation. The free liftoff could just be a bonus as a racial, or it could be an auto spend and use a stamina charge. Considering volpera get a free second ‘anywhere outdoor’ Hearthstone, I don’t think a free lift off would be notable for us.
Edit: or, Soar is instant cast, but has an internal cooldown of 10 seconds during which is must be normal cast. That could keep it from bot-farming but still be very cool and fun for normal players.