This will never work. Sony already tried this with the PSP and it failed badly. Developers will not support this at all. They will target the lowest common denominator and not alienate an existing potential customer base.
"Our games will be backwards and forwards compatible" they have said the exact same PR line last gen and the gen before that. Likely not going to happen. With incremental upgrades you give up the ability to go back and correct fatal hardware/software design choices. Imagine if the PS4 was just a PS3 with more SPEs and more memory.







