Not the original poster, but economies work in cycles... so eventually money won't be free, and funding won't be so easy.

When that happens, lots of VC-fueled companies will shut down.

In other words, I think it ends with a return to a funding climate similar to 2015-2016 where money was available, but money also wasn't free. And financing rounds were smaller.

Aren't we close to an abundance of energy and thus a huge expansion of the economy?

There will be much more resources that can be bought with money, so money will be worth more, compensating for any bubble that is created right now.