It honestly feels like a very high price to pay for the sake of rapid expansion. It doesn't feel appropriate to remove the unanimity rule before the EU becomes a true union of federated states. The usual Polish existential populist rhetoric notwithstanding, it is the wrong approach to European integration (broken clocks occasionally being right, etc). At this point, for me it's enough to reject this report.
For fairness: It is positive that the report suggests giving the right of initiative to the Parliament. The plan for the Commission is also an improvement although it sounds a bit confused.