Definitely. NEO apparently can process up to 5-10k tx's a second. Once we find a solution that can surpass VISA and other providers, there won't be a need for them. They're just convenient for the time being as far as purchasing anything.
There already is block-chains who can surpass VISAin their TXs number , but thats only the first step. Now how you will incorporate this is exsiting payment system?
Shops have CC POS not crypto POS and why they should spend money nd effort of adding crypto pos..