I think this view of parties is very common, but misguided.
I don't like further entrenching parties in our electoral system. It's the wrong type of electoral reform.
That said, I do see value in a mechanism to recall representatives but don't think it ought to be exclusively tied to floor crossing.
MPs can betray their constituents in all sorts of ways, floor crossing seems pretty benign to me, because they can still advocate for their constituents in the new party, and in some ways they could be more effective.
I did actually receive a phone survey from Don, and I don't remember if it asked about this but I'm sure if it did I hadn't thought it through enough at the time. I do really appreciate that he's trying to make decisions based on constituency feedback.