A company like Disney is close to having a monopsony on visual effects. (It's not quite a monopsony because there are other studios, but I wouldn't be surprised if Disney outspends the rest of the industry combined on VFX).

Normally I'm skeptical of unions. But when you're selling to a monopsony, who was free to merge with almost all of its competitors, I do see the economic justification of merging labor into one negotiating entity as well.