there are already a few outthere that are sold with an inbuild WAN card...
ex: dell laptops sold with wan card http://www.dell.com/us/p/d/campaigns/4g-3g-mobile-broadband-...
ex: dell laptops sold with wan card http://www.dell.com/us/p/d/campaigns/4g-3g-mobile-broadband-...
Edit: I did pay a bit extra for that, so I suppose my answer to the question is: "Yes, I would, and I have". But I would never buy it if it is tied to one carrier.
That to me is the challenge. I'm shocked there aren't recessed USB slots that would hide or cover the dongle. The archos and arnova brand android tablets have this and it looks good and works well, and can be used to whack in extra storage if you don't need the connectivity.