Folks,
I don't know where you're taking this rather discouraging statistics from. I can't tell about other schools, but as a Wharton student, that was rather easy to get into VC/PE for all those who really wanted this.
Most of my Wharton friends ( internationals, no prev. PE experience whatsoever), all those of cause who worked to get it, got a nice PE internship. Truth must be told though, most of them are working in UK, not US, but does it really matter?
As to the VC industry, I know at least 4 people here, my personal acquaintances, who got a VC summer job again without any prev. experience in the field ( some are even without any blue chip experience, just your regular start-up techies ).
Yours truly, for example: just an IT guy, international, no blue chip, no prev. work experience in US. No networking whatsoever. Sent about 7-10 resumes , got 3 interviews and 1 offer in a VC shop close to home.
So keep your chins up. If you really want it , you will get it.