Does Blizz really expect people to keep running it for months and months without being able to pug it easily?
When they nerfed previous raids it worked out really well for the community. There was still heroic for the hardcore raiders to fall back on and casual players had the opportunity to pug normal.
Siege has been out for a few months now. It's not like gear or time is the reason people aren't able to progress. A nerf will help guilds that are stuck as well.