I believe they aren't allowed to change the hardware spec, so at some point they will not be able to get supplies anymore. As far as SimpleDB, yeah, believe it or not, on AWS bill, it still exist and most support engineers from Amazon don't really have a clue why it's there. I still don't know which service we use is using SimpleDB. Only a few cents, so nobody really care.
Well, they advertised m1 as such and such hardware spec. I don't know if in their ToS they state they would be allowed to change the spec without notifying customer. Maybe.