If everyone in tech took the attitude of "let's not bother now, <next big advance> is coming soon" then noone would ever build anything.

Yes, Raspberry Pi is cool and you will probably be able to do this with it some day. In fact, there are a billion platform alternatives available right now (or soon) at various price points. Albeit not with the internet-punter coverage that the Pi has (deservedly) gotten.

However, krohling is doing this with an Arduino right now and it looks to work just fine.