With this move all small angel investors are out of biz. This new thing will change the dynamics of seed investments forever. Startups (in pre-seed stages) must embrace constraints to stay focused on what really matters, must stay in the garages working with few resources. This is like give alcohol to babies, they will get drunk.
Small angels will just need to seek investments outside of YC, but that takes some good companies off the table. It will definitely reduce the number of angels in SV within 2-3 years, only the smart ones will survive.
It looks like a bubble, and in the human history every bubble has crushed; soon or later. There will be a lot of burn outs and wasted money over next few years.
As for whether valuations are creeping up and things are getting bubbly as a whole - perhaps, but so what? Bubbles are great for entrepreneurs, and despite their chaotic collapse and impact on investors, are arguably good for society as well. A lot of innovation takes place and progress gets made when money is cheap. After the bubble collapses, this innovation doesn't just vanish - instead, it sets the stage for further economic growth.