I'm still a bit tired after waking up, so maybe this isn't the best idea. But I had a bit of a thought.
I think much of the toxicity in LFR stems from lack of accountability. Now, while there will always be a degree of this in queued cross realm content where you're not likely to see the group again, limiting it to ten people may help reduce this. The encounters could be tuned a bit more tightly, making it a bit less faceroll and helping to legitimize it a little more. If a dps is afking in a 10 man lfr I think they'd be more likely to be found out and kicked than in the current model for example. It would still be the easiest raid difficulty for sure, easily pugged by competent individuals, but reducing the size might make it easier to kick the toxic elements by not tolerating the afkers due to some tighter tuning.
My hope would be that with moderately tighter tuning due to the 10 man size (not enough to make it not puggable of course, still want it to be a good deal easier than flex) it would mean more of the toxic/lazy people get kicked, leading to them either no longer queuing as much or shaping up and contributing. Less players means a bit more responsibility placed on the ones that remain. If the level of toxicity reduces, maybe people wouldn't mind 'having' to run it for stuff and tier/trinkets could return, or help to improve its public image a bit.
The two downsides I can think of off the top of my head:
1. Longer queues for dps probably since you would still need 2 tanks presumably unless they dumbed down the tank mechanics so that 1 can do all of it without outgearing it.
2. Might feel less 'epic' for some people with only 10 players. Wouldn't bother me but I could see it bothering some people, especially those that don't have the means or time to do higher difficulties of raiding.
Anyone think this might work, or would it just blow up in blizzard's faces if they did this by not helping to reduce toxicity and just increasing queue times for non tanks?