Well I don't know if the next PlayStation (PS4) will run Android, but I wouldn't dismiss the idea out of hand.
I really enjoy my PS3, don't regret buying it for a moment, but, it's one real weakness for me is the web browser.
Sony seems to be at a total loss as far as making a decent web browser for PS3. Perhaps an Android based system would include some sort of version of Chrome.
I'm not saying web-browsing on the PS3 is a big issue for me, but it would really be nice to see some real improvement in that area.