Looks like a serious issue indeed! I support a resolution. Thanks to everyone involved in bringing this to light 
If we’re going to do a quick fork, it would be wise to also get a resolution to the issue in where it currently takes 2 stacks blocks instead of 1 to fetch the Bitcoin block header (see issue here). Currently Stacks 2.1 doesn’t work as described in SIP-15 which is a problem for governance
@FriendsFerdinand is currently working on a PR. We’ll see if we can get something out by 9am ET today, if not it would make sense to get help from someone from the Core Engineering team here