In some senses this will be harder on the raspberry pi. Certainly more complex. You'd have to worry about the whole stack from the kernel upwards. On arduino, you handcraft your protocol right on top of the TCP/IP lib and just squirt it straight into the bootloader. Done.

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.