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the memory card senerio makes no sence. they can use whatever they like. for some very ODD reason saves are such a big issue to you. who the hell cares about a damn save? the old games will save on whatever sony wants em to. if they want to work it so the old games save on a differnt mem card. they can. if they want to make em save on the HD, they can. it can be done. they arent stuck with a certain memory card slot or anything.

the controller issue is right. which is what i said MS and nintendo will have that problem because i think they both want to make changes. Sony doesnt have that problem and if sony wants they can add a slot on the controller. that doesnt harm anything.

the cost as i've already said, if its too much to do it may not be worth it. but they have to weigh the price of that vs the money it would bring in. because believe it or not people DO like backwards compatibility and DO use it.