It does mean, though, that the Period of Stay you get now becomes real important: you don't want to be stuck with a 30-day limit for 10 years. Especially if China continues its normal practice of cancelling your existing multiple-entry visa if you need to get an extension of stay.
I don't know. Day/stay is pretty important to me now (i.e. I make sure to never overstay). My attitude wouldn't be any different if I was on a 10-year visa than it is for the 2-year visas I've been getting. And, I will still try my best to never let my days/stay number drop below 120.