Phones are effectively PC's, and will more and more take over their role. Anyhow, there's a big fat 'I told you so' to whoever I was arguing with on here when I predicted this day would come many years ago :)
POS systems (as you know them) won't even exist in the future! Think forward. Sorry, but Microsoft is dead. They have zero vision, because of this, they will play no significant part in the future of computing.