I'm always on the pessimistic and risk-averse side with rising asset prices - I still believe that cash in your hand is king, despite all the woo and yay, whether it's cryptocurrency or real estate. And I'm frequently wrong - some things do seem to just keep growing in value.
But man, Ethereum with a market cap of $11bn going on $12bn? That's not far short of Twitter's $13bn and Twitter's been going more than ten years. When I went to see the Ethereum London office a couple of years ago, it was like three of them and half of them seemed insane. And BTC pushing $2k, so the average house price in this country is just over 100BTC - surely, something's got to give.