The centralization of BTC will lead to its downfall. Eth is possibly a lot of smoke and mirrors but it is a fun ride just now and it has potential to go massive before common sense prevails. It does have potential, at least if the hype is believed. But it can also go down the dead end route that BTC has gone.
What makes ETH possibly smoke and mirrors and how has bitcoin gone down a dead end route? I am truthfully curious why you say those things. I know little to nothing about ETH and from what I've seen with bitcoin, it is doing quite well and has been for a long time.