It’s not a deal breaker at all. Done deal in the austere senate and if it comes to the floor of the house there are enough vichy republicans to pass it there as well.
It seems the Senate is going to try to “jam” the House on Thursday and then leave town, take-it-or-leave-it. My guess is, the House will say eff you to the senate if it contains anything like a special interest exemption for the Democrat unions. You could be right that a handful of squishy-Vichy Republicans would help the rats pass such a bill, but that could only happen if the Hastert rule is flushed down the toilet by House leadership. That’s not going to happen.
Can you imagine the outrage if the House passes ANYTHING without a majority of Republicans supporting it?