And you can't know that there will be a significant market for it.
And considering how many "technological revolutions" turned out to be flops and that so far no one can think of anything which might be useful for consumers on surface I am pretty confident that surface too will not be "the next evolution" of the PC.
Just making it affordable doesn't mean that people will buy it. That microsoft makes a survey means that even they aren't sure if consumers will buy it. And only consumers would be interested in a surface PnP programm.
This technology would see more application when made into small tablets (sized like an Ereader, thus portable) which communicates with a central server in the house and can store data and access the web. That would be much more useful than a big, stationary "I can resize pictures but nothing really useful" surface.
Surface has a ton of applications. It can be the center of the entire moden house. Adjust your thermostat, light controls, display pictures, share music, probably even dial a telephone and speak to people.
Right now, we use Iphones to show other people youtube videos - and it is awkward and annoying trying to show more than 1 other person.
The applications are limitless. The hardware just has to be affordable - and I thnk $1500 is it - LCDs and Plasmas started to take off at about 1500 to 2k.