I think a lot of the current doom and gloom around the thrones meta has to do with the natural lull we are experiencing in the games OP cycle. This is even more emphasized by the delay in the new Game Kits. But, I also think FFG needs to take notice here and do something, sooner rather than later, to inject excitement into their best LCG game, by leaps and bounds.
What if FFG instituted a revolving legal pool of cards to coincide with their new OP Season Schedule. For instance, OP is now broken up into 3 Seasons. I like to think of them as The Regular Season (Jan-Mar.) , Regional Season (Apr.-Jul) and Championship Season (Aug-Nov.) SO, suppose FFG institutes only certain blocks of CPs legal in official tournaments for each of their three seasons? This would create three major meta shifting periods of time each year, and that's independent of new cards releasing (which would create more micro-meta shifts throughout the entire year).
I would make Core set and Martell/Greyjoy Expansions always legal, but let everything else fall in and out of rotation in different combinations. It would allow new players to buy only the cards they need for each season (spreading out the cost to be competetive) and it would also allow FFG to plan for very interesting tournament seasons and chapter pack releases.
Some people here on the boards and elsewhere want to see a vastly expanded restricted list, but that (and rotations for that matter) seems detrimental to the ideology of LCGs. A Living Card Game should have few Dead cards. But, with cards rotating in and out for "official" play, you get those forced meta shakeups that the old rotation system in the CCG days accomplished.
Now, for this to work I think FFG HAS to follow through in a big way on their recent announcement regarding OP. The world ranking system they are devising would be a major incentive for people to run "official" league play and tournaments, following the revolving rotation schedule.
I am like others that believe the card pool is getting out of hand, but with this system you could really tune the OP program into the driving force of the game, which I think is necessary for its long term survival.