More likely, since pretty much every VC in the valley needs access to the YC dealflow, becoming persona non grata with YC will force VC firms to make personnel changes.
Dealflow is everything in the VC community, but this is pure hyperbole. Statistically speaking, there are way more companies that drive VC returns that come from outside of YC than the ones that come from it.
Do they though? It seems every demo day some VC posts up a blog about how they are not fans of demo day anymore for X, Y and Z reasons and that they're no longer attending.
Don't get me wrong YC is great and all but you make it sound like most of the VCs need YC but so many companies outside of YC get funding I'm not convinced that's even close to the truth.