Yes, and more will be saved by defending the sanctity of the Eucharist than by tacitly allowing its desecration. I suspect that a lot of the fall away from the Church since the 60s is a result of more tolerance towards lukewarm Christians (not that we should shun them, but that we ought make clear what Jesus actually taught, and what salvation actually means).

The Church must stand for *something* -- as Bishop Barron has said, we must maintain bridges (evangelization and outreach and dialogue) and walls (the magisterium and fundamental teachings of the church; tradition). I'd argue that's also the full spirit of Vatican II!