I am not sure "dismantle" would be the case. I mean Bayern is a bit more physically gifted team and they play like a machine, whereas Barcelona is a team of mind and they play with a good tactic and technique at the same time. So, it is going to be battle of two different mindsets and I am not sure if any team will dismantle the other.
So all in all, we should be focusing a bit towards how we could end up with a situation where it is close to a tied game, maybe one will win but the difference will not be big neither in score nor while watching the game neither.
But for now Nagelsmann is also busy with the condition of their players who seem to be losing productivity, especially when they see their draw for 3 weeks in a row.
It becomes a bit difficult if Barcelona play like they always show in La Liga this season. Apart from H2H which put Bayern ahead, it will still be a little difficult to predict who will win now.