By ideological shortfall you mean he signed Rodri to replace Ferna right? Because that's pretty much the only place where I could see dismantling and rebuilding in his image? For the most part the rest of what we have/have bought is the same group that got 198 points in two seasons.
I agree to some extent that he may not be getting through to certain players, but ultimately the bigger picture as I said in my previous post, is that there isn't a magic wand manager who is going to come in and massively improve results/performances in the medium term. You might get a new manager bounce but when it comes to putting the work in on the training pitch, Guardiola's methods are second to none. You don't need to look at his results to know that, you need only listen to what players who have worked under him have said.
Obviously things aren't great right now, but I'd be very very wary of simply writing Pep off. As I said the board need to hold their hands up too and accept that their recruitment since summer 2018 has been far too reactive and whilst they like to pat themselves on the back for being smart, you're not smart when your smartness ends up with players who aren't quite what you need.
With the amount already invested in Guardiola (and Txiki and Ferran) by the owners, I fail to see anything other than him being backed with big money in the summer to buy 3 or 4 players who he can drop straight into the best XI. It's really not THAT surprising that players who did 198 points between 2017 and 2019 would have a drop off subsequently. The group needs refreshing and competition arriving.
My guess is that they'll sell a 'big' player from the group in the summer too. A shot across the bows of those who are left.
My guess would be Bernardo or Mahrez.