My big issue is the spam one that you mentioned last. Seems like the mining is going to create these discount tokens and there will be a finite supply at any given time, but if enough single users spam the account creation, it's just going to cause headaches like the ones we've seen. On the bright side, they won't be able to accomplish anything with the accounts since they'll have practically 0 Steem attached to them. Still, it doesn't resolve the bottlenecking that people have been complaining about non-stop in #help.