Hmm. Part of it depends on how well it runs things - I'm a little unclear on how well it works, but... it's a very large screen and tabletop, and has some nifty things to it.
So, 2-3k, say? Totally not yet, but still, within one order of magnitude.
I totally think the technology will be a no brainer within 10 years or less. I'll go 'Hmm, I need a new table. Oh, hey, it only costs what to get a 40" screen embedded in that table? Done.'