In terms of the blade "sinking" into the material, it all depends on how soft the material is and how angled you have the blade.
When I used my blade for landscaping this summer, it generally would not dig into the grass if I ran it over the lawn. It would, of course, level off any peaks or mounds. If I angled or tilted the blade, then it would dig in more.
Even using it to level dirt piles, I would have to make a number of passes to get the dirt scrapped down to the level that I desired.
Many times, the tractor (
B7500) would get bogged down by the bite that the blade took, and I'd have to lessen the bite.
I think that is the key to using the blade on a good paved surface for snow removal. If the blade is either perfectly straight or angled back a bit (ie: the top link lengthened), I doubt that you would dig up the asphalt. Even if it did start to grab a solid piece of asphalt, I think that the combination of the tractor moving slowly and the wheels already being on a slick surface (snow/ice) will prevent any large chunks of the driveway from being ripped up (because the tractor would end up stopping).
I guess I'll find out after the first snow.