The patch hasn't been calibrated properly yet!?! Let the devs work for crying out loud, they're trying new stuff with WSE and just because they didn't get something right to begin with, doesn't mean that they're going to leave it like that does it?
Every single time there is a new patch, they work and work and work until things are sorted and most of the time one class gets a hit to the face for a couple of days and everyone calls for a free respec/free heirloom change etc etc and every single time it gets sorted. Have some patience!
I already know this. But if the changes are kept, which is fine for me (read : I'm happy with the new difficulty values), then the only way to "get it right" is to hand off at least a free respec. Or maybe take back all the heirloomed items that had their difficulty changed and give the corresponding amount of heirloom points as a refund.
The possibility to use another horse before respeccing doesn't solve the problem with heirlooms. I don't feel like I was using an OP item given it's price and frailty. In fact, horses weren't the best thing to heirloom for cavmen.
Anyway I sit on a big pile of gold (otherwise I couldn't use a horse, what a nice game) and earn money with trading. I will probably sell my horse for peanuts and buy the next FOTM +3 item if the nerf is really that hard