I'm still using the tanks that I bought in 2011. Still work just fine.
There are still some MTL tanks I want to try and a few mods. Mods may or may not last for years. Tanks can be repaired if you have spare parts.
I usually watch until something I want goes on sale and then grab it. If it's dirt cheap I'll buy two. I don't really expect vaping hardware to get hit hard right away. It's the dang product testing cost that's going to kill the industry. It's a form of taxation to eradicate the product. That usually results in a big bootleg sales market with high prices.
China makes lots of money from vaping, among other products they make.