WETH (on Ethereum itself) is totally different. It's a pretty simple contract, doesn't require code on other blockchains or offchain code, and there are no Ethereum accounts with "special permissions" so the attack surface is much much smaller.

Contract code if anybody is curious. It's less than 100 lines of Solidity, easy to read even if unfamiliar with the language: https://etherscan.io/address/0xc02aaa39b223fe8d0a0e5c4f27ead...

Sure, thought that was implied. WETH on Solona is not the same thing obviously.

How much impact would a total cryptocurrency collapse have on the outside economy?

Crypto (and more so Solona) has an extreme trade deficit, it's importing way more capital then it's currently exporting (the primary export today is blockspace, I think as DAO's start running SASS services, that will increase the exports). The impact today would be nearly zero. As the deficit evens out, that might change. The local crypto economy is pretty young (it's virtually brand new). As it expands these capital flows will probably change.

I haven't read anything concrete that shows a clear contagion risk, but https://twitter.com/angela_walch is one of the people in the space to follow that is talking about it

Nearly zero.

Probably a nice uptick

Or millions of working people would suddenly be able to afford a gaming GPU and would disappear into imaginary worlds for a couple of weeks.