I'm hoping YCs next 'big' move for growth is to open an accelerator in either the UK or the EU. The US is moving in the wrong direction and the EU needs institutions like YC. Plenty have tried and failed to replicate YCs success both in the US and the EU but I think YC could make it happen.
YCs success has nothing to do with just YC (not to take credit away) but rather from the fact that the US is a large unified well-regulated market. EU has sensible rules sure but the market isnt unified and the individual countries dont have big enough markets to sustain large numbers of software companies. YC itself is honestly quite open with their knowledge but its just that EU in itself is a pretty terrible place to run a business. Lots if regulation, some good ones.