Games on Demand and PS3 Full Games to be compatible with next-gen hardware?

How confident are you that Xbox 360 Games on Demand and PS3 Full Games will carry over to and be compatible with the next consoles from Microsoft and Sony? I get the sense that because these are digital downloads, many people expect some level of support moving forward. Is that a foolish gamble? Will you be disappointed if your library remains forever relegated to current hardware?