Very few. I think it's much more a matter of job culture and a bit of red queen (useless arms race) competition that has brought on this situation. Probably with a sprinkling of politicians wanting to be able to say that "in my country 50% of high school students go on to university" when they hob nob at international conferences. In almost all white collar jobs the apprenticeship model would work just fine, but that…
That's extraordinarily presumptive. Is IBM and a handful of others gods of all things HR? Why? There's conflicting data on both sides of the table, IBM just went with one choice over another. Recently, by the way, so we don't even know it's going to work. Furthermore, there's a strong argument that the move was an easy way to achieve layoffs, which kind of nullifies the "IBM is big and smart and so they switched because remote work doesn't work" argument.
Finally, I'm not even sure some of these companies you're describing as elite (I'm assuming you mean "companies in the bay area we've all heard of that don't do remote work") are universally regarded as elite. And how do you account for the actual bay area giants that do allow for it, such as Google?