Well, here's how it'll go. Either their revenues from ticket purchases will stay the same, they'll drop, or they'll go up. Predict what you want, but the cash flow is ultimately what makes the decisions, which means that it's in our hands.
For me, it's extremely unlikely that I will ever pay 2 tickets for one set anymore. I admit I have once or twice in the past (ahem, Suzie Q), but it'll be far less likely now.
Regardless, I think having an RSS feed specifically for the featured model would be a nice touch and help to keep users up to speed.