Here's my .02:
MCX, their partners, and other "industry insiders" are predicting a fail for

pay because 1) new equipment and 2) lack of "rewards or incentives" for using the service on the part of the customer.
Apparently, their studies have shown that people are more likely to use a mobile payment system if the customer receives some sort of points or rewards from the merchant.
I don't care. Seriously. I don't care about loyalty points or rewards for things that I'm already going to buy anyway. I care about convenience. And MCX and their currentC app are NOT convenient.
Get out phone, unlock phone, go to app, select whatever needs selecting, generate qr code, use pin to authenticate, scan code (maybe more than once, because we all know how well that can work) pay. Done.
With

Pay, I' just pull out my phone, tap, and use touchID to verify. done. No opening the app or unlocking the phone... it's much more simple. There's no app to update and manage and find. It just works automatically. I don't have to worry about looking at points balances and reward incentives...
I can't speak for everyone about rewards and loyalty and points, but for me, I'd be a more loyal customer the faster and easier I can get in, get what I need, and get out.