"The solution to this dilemma, of course, is simple. Private equity firms have become large and rich enough that they should do their own damn recruiting at colleges to hire junior personnel."

This is already the case, at least at Wharton. A number of the PE megafunds recruit undergraduates here, specifically Blackstone and Silver Lake. I only really know of one or two offers being extended per year, but that's because private equity shops simply have fewer entry-level positions -- they can therefore afford to be picky.

I'm sure that PE middle-market companies also recruit here (my knowledge here is more limited, as I gravitate toward the technology portion of my education rather than the finance portion), but it seems likely that students would take a bulge-bracket investment bank over a middle-market PE shop.

It's simple supply and demand.