EMV is coming to the US, Yes Walmart accepts it and so do many other merchants, however it still doesn't make this fob useless.
Just because the terminal has Chip & PIN, does not mean it has NFC (See: Walmart). However every Chip & PIN Terminal I came across (both in the US & abroad) has a mag stripe reader, for reading cards without the chip, gift/loyalty, as well as for a fallback if the chip failed for any reason.
Your bank can issue you what's called a "Mobile mag stripe" card for this purpose and it'll work just fine for many years to come.
EMV cards have what's called Service Code 201, which means that if you try to swipe the card anyway, it'll state "Insert Card"...unless the chip is failing.
I don't see Verifone or Ingenico getting rid of the Mag Stripe swipe anytime soon, as many gift cards, loyalty cards like Safeway Club are not going to be a chip, simply because of cost.