Wondering if as more software updates come out will it render older Ipads (2&3) useless. I have an Ipad 3 and while it seems to be working fairly well it is not as responsive as it once was. Best Buy is giving up to $200 on a trade in and I am considering taking the hit and getting a new mini 2. I am disappointed in the service life of the Ipad 3. Anyone else thinking the same?