Are you suggesting that things basically remain the same, sans any fees?
I'd sure hope so, unless the point for the companies lobbying for this is to kneecap the Apple Pay user experience. My feeling is that the UX itself isn't on trial since partner brands are front and center during Apple Pay transactions.
They could be right, and it wouldn't surprise me if there are companies willing to make everyone's experience poorer if they think it could help them.
A real-life example of this "doesn't play well with others" philosophy is Netflix. Instead of being a good Apple TV citizen, they refuse to integrate with the system TV app, with universal search, etc. Somehow they think being a good ecosystem partner is a risk, but in fact, every inconvenience reminds me to reevaluate whether they're worth it.