If I could empty my wallet of cards entirely it would be worth using Android Pay however some places still don't take it so I need to carry the card. Since I have to carry the card why bother with Android Pay? Then I have 2 ATM debit cards and I would still need to carry them right? Then I have 6 store membership cards I still have to carry. Now if Android Pay could take care of ALL of these things and work everywhere I'd certainly use it!
I've been using Samsung Pay for about 18 months, and I've given up carrying a wallet.
Credit cards: All in Samsung Pay, which I use for 95% of my transactions
ATM card: Don't need it, since Wells Fargo enabled app-based access to ATMs
Health insurance card: It's in the insurance company's app
Loyalty cards/membership cards: In Samsung Pay
Instead of a wallet, I have a little elastic pouch attached to the back of my phone where I carry my driver's license, a credit card (for restaurants, mainly), and a $20 (you never know.)
I would bet in the next 5-10 years, I'll be able to give up my license and the extra credit card. Many states are testing electronic licenses, so I probably won't need a hard copy. And, restaurants are already starting to catch on to electronic payments, which are bound to grow.