Well... at 33% it's a total loss... so 1987 that one day wasn't, since it was... what.. 23?... over the days before and after, yes... total loss.
But with 3x ETF, at -33% normal market you're down 100% as well... so same position, but you're still in the game indeed.. If you would have a few dollars left with the futures trade... you could swap to buying the 3x ETF and be long again.
EDIT... hmm.. I wonder... if the market falls 40%... the 3x ETF is at minus -20% assets. Because it drops 120%... So is the ETF also total loss and completely liquidated? So basically... you're actually out of it as well? No position since it will not trade anymore?
Short vix future would lose more than 1000%