They have specific contracts etc. in place. They are going to need to be hit a lot harder before there is any real impact.
A lot of those contracts are probably dependent on how many subs they hold at one time, else they could just dick off and do whatever until the contract ends. And it wouldn't make much sense for a company to sign off on something like this without a stipulation in place.
There's a reason Youtubers are all about subs. There's a reason they keep upping their previous videos in hopes of more followers joining, or keeping away from decline. It's a heavy burden, and one big fuck up could ruin your channel.
Plus, those subscribers were fans until they pulled this shit. And worse off, people who didn't even know those idiots sure do now, and probably won't subscribe. Couple that with a bunch of popular youtubers weighing in on the issue shitting all over them, they don't have a chance in hell at retaining or bolstering their brand.