Will the vendors adopt it?
Will the vendors adopt it? Only if the margins are superior to what they are getting for "business" PCs. And the volume will have to make up for the raw loss in revenue.
It's going to have to be consumer driven. Which means they will come from a smaller company who will either be bought by IBM/HP/Dell or driven out of business when one of them decides to join the fray.
Blade PCs are a great solution, but I don't think many people see the problem yet. Most companies now see laptops as the solution to a lot of their desktop issues. My current customer certainly does (even contractors are issued company laptops).
Blade PCs would solve the problem of the worker taking home a million names, addresses, SSNs, birthdates and credit card numbers. If they need to work from home, issue them another client (like I said, they better be cheap) and use a VPN (broadband goes without saying. Noone with a business need uses dial up).
I wish them well.