I don't understand this desire to come up with some new tactical plan. You don't throw out what made you the best team in the world over two seasons because of a run of bad games - which can happen to any team, at any time. You certainly try to improve what you do well, work on what you do badly, and try to evolve to become more dynamic and unpredictable, but you don't just say "That's not working anymore, we're starting over" just because you've lost a couple of games.
In terms of Plan A's and B's, that is exactly why we signed Jota and Thiago instead of a CB in the summer. Jota to provide genuine competition for places, and Thiago to help pick apart low block teams. Why we've not been able to do that is a good subject of debate, but it's not for a lack of trying, or lack of foresight by the management team. The huge risk we took in going in with the 3 CB's + Fabi, was mainly because we wanted to focus on being more dynamic and unpredictable, especially against low block tactics. Why hasn't it worked, is a good question.
I think we've been spoilt the last two years and have some very high standards that we've not met at all this season, for many different reasons. To an extent, I did think we'd end up losing more games and winning less this season, simply because the standard of 95+ points we've set last two seasons just isn't possible, or at least isn't likely, every season. Teams have sat deep against us for a while now, and we've found ways to win games. For whatever reason, it's not happening this month and we've put in some of our worst performances of the last year or two (although credit to Brighton last night, they were brilliant). That said, given how good we were before, is that really worthy of throwing the baby out with the bathwater? I don't think so, and although the title race may be over now (beat City and that looks a bit different), I think we need some perspective. World class managers and teams don't become sh*t in a month, they're allowed bad runs and bad form, it's football, it happens. As Klopp says, "the ball is round and rolls both ways".
That said maybe I'm just more optimistic about our future beyond this slump, or less emotionally invested this season, all just feels a bit meh without fans for so long.