The issue with removing consensus is that consensus leads to stability, and stability is perhaps one of the greatest achievements of the EU (just look at how much war Europe saw before the EU). By enforcing consensus, we can have slow but steady progress, rather than the current people in power spending a bunch of time just undoing what the previous people implemented. I'm a big fan of consensus-oriented political systems.

With that said: It should be possible to take away a countries rights to influence decisions, either based on some pre-defined criteria, or on a vote requiring something close to unanimity, where the offending country is of course not allowed to vote. We can't have someone like Orban holding up and disrupting the entire EU pretty much on his own, while holding on to power by flagrantly violating principles at home that countries need to follow to join the EU in the first place.