If Google wallet and Apple pay both have in-app purchasing (not sure if Google already has this) then this could definitely kill PayPal, I agree. No point in it if everyone accepts both Google wallet and apple pay online.
Google Wallet, Apple Pay, and Paypal are 3 different things.
Paypal and Google Wallet are similar but Apple Pay has nothing to do with them.
Apple Pay can use the Paypal Braintree in fact.
Google Wallet can't do all the things Paypal can do.
Apple can't do anything except be a front for your cards.
Apple Pay IS the best way to choose to pay now if its supported by the retailer you are at. But only half the world has it.
The other half will have to go with an alternative way to pay.
Google Wallet is only a tiny piece of what Paypal can do.
Google Wallet is not common as online payment, and it has no advantage as NFC because look what is happening.
Paypal is strong in online, and can be used in retail already too. It can be like your bank too, unlike Apple Pay which is just a payment front.
Unlike Google wallet its international, and everyone already has it from the eBay decade.
Paypal also has other payment methods like phone and pin, chip and pin cards, regular debit paypal cards, paypal credit cards with points, and any other card you want to be used as a simple front like Apple Pay.
The base is bigger than anything for online payments, and its easy for them to take a huge bit out of retail payments.
So when the Android army chooses an Apple killer, it will be easiest to just get the Paypal app and use their payment ecosystem that already runs so deep.
Like right now if we did a test a gave someone a fully loaded/enabled paypal setup and an Apple pay setup and sent the person to a random shopping center/plaza, they would have more luck having paypal work, weather through online purchase/in store pick up or pay with paypal enabled merchants, you will find its so deep already, Wal Mart Online takes paypal, Best Buy lets you buy online and pick up in store.
Apple Pay is even better than Phone# and Pin though, I was convinced of that after using Apple Pay.