I'd say participation for us has been down around 20% or so since the update, general 'zeal' from players has also been lower, aftershocks of the update IMO.
I'm in the Centum family of clans and our clan is mostly all guys who have been together for 3 years that are maxed. Game is boring to most of us now and all we have left is pushing and war. Most guys only come on to get their war attacks in chat for a sec then bone out. Has really killed the game for me. I ended up taking 2 of my 4 accounts and putting them in a clan by myself just so I could farm th5 and have some fun again. Don't know how much longer I'll keep playing though TBH