I'm a frequent visitor of /r/soccer. The only poll they did[0] had a staggering 88% in favor of the blackout, with 80% in favor of keeping the sub private as long as it takes for reddit to change their mind. I would be surprised if other polls had such different results, as I'm not sure what would make the /r/soccer community so drastically different from the rest of reddit.
[0]: https://www.reddit.com/r/soccer/comments/1429lkh/meta_thread...