I don't think he's necessarily coming up with the right answer though.
LFC and teams that can successfully play that kind of system are at a distinct advantage right now.
Nobody has quite figured out the response yet. This is how cycles work in football tactics: someone does something new, gains an advantage over how everyone else is playing, and it takes teams a while to work out how to effectively counter.
I think some coaches will figure out how to effectively counter LFC's system.
I think 3 at the back is part of the answer - man mark the front three. But I would go 3-5-2 or 3-4-1-2 with two wing backs to counter LFC's wide men, two central midfielders, and a free false 9 + 2 strikers to mess with the zonal marking down the other end.
The strikers needed for this would need to be tall and strong, think Mandzukic, Zlatan or Dzeko. And I would try to play long and move up the field very quickly.
Part of LFC's succes rests on their successfully countering and winning the ball back quickly with high pressing since most teams like to play the ball out of the back. Going long would frustrate this. Part of LFC's success is that VVD has given them enough strength and cover to not be exposed to this too much. You would need enough strength and speed in your own players to challenge.
I know this is half-baked, but you're not going to out-LFC LFC so might as well try to come up with something effective to counter tham.
Interesting times ahead. And please no more 4-2-3-1.