They increased the money supply by 40%, then the banks leveraged that up. At the start we were still in ZIRP. Surprise, surprise - that money goes somewhere. You can only store up so much extra toilet paper and home gyms, so you get $8 eggs, 9% inflation, and housing prices rising 50%.
Now that money has rolled through the economy its in the hands of wall street, so there getting in on it too, with investors buying single family homes in mass to rent or turn into airbnb. So many ways that can go wrong I won't even start.
So in the end something must change. Either we all become renting serfs to our wall street masters - just like in 1600 when people got in leaky boats to come here. Or wages rise to catch up. Or housing slides. Or maybe all 3. Median household income is about $75K, which means at 30% of gross median household can afford a $300K mortgage today.
Anyone that thinks that housing costs can go to the moon forever clearly does not understand economics at all.
I don't think it will keep "going to the moon". But it's not going to the basement either.