After watching that recent 8v8 fight between AD and KOA I was reminded of the way Albion used to do GvG fights where you had a 5v5 arena and both guilds sends their best 5 fighters to do battle and the winning guild then controls the territory that was being fought over.
My proposal is to make realm challenges a challenge against an entire map supergrid and all the cairns/seamarks within. Whether or not cairns are still necessary is another matter but basically after the initial challenge the defender gets to choose the time of the fight and then each kingdom has to fight it out with their best fighters in a 10v10, 8v8 or 5v5, idk whats the best amount.
This would be a solution to so many things. Firstly it would satisfy the lack of motivation PvPers have to play when meteor is their only lategame event. Secondly it would correct the ridiculous present system of kingdom territory being about which nerd has bigger cloth farm and cairn building alt army and not even remotely reflecting which kingdom is strongest. Thirdly it everyone crying over "unfair" fights would be happy with a way to guarantee fair fights.
I think this would be very interesting content for ppl to both watch and play and give big villages a lot of motivation to tryhard.