The far bigger threat is not the code going away but it being censored at the network level. Already, a single miner has censored tornado transactions, that being EtherMine, which has 28% of hashpower. If the next two biggest miners censor it too, assuming hashrates do not change, then all tornado funds will be frozen. Very bad situation for tornado users. POS may change this but no guarantee. People should be mad at EtherMine, not at the US govt.