how many stand alone nodes we have?

I mean nodes run just for the sake of network transaction processing. Not core wallet running as nodes.

TLDR folllowing:

If a market crash comes, a lot of wallets will go offline. Already went down from some 800 to 600. I follow Ravennodes stats and recognize a lot of so called nodes (core wallets) with IPv6 coming and going daily. Old nodes on IPv4 are much less.

How many nodes could/will remain permanently online after a 2018 style event, to secure the network? Mining rigs don't count as much. I am a skeptic at core but the fundamentals of Ravencoin are so good that it would be a pity to die like 99.99% of all shitcoins will.