Bitcoin would be easy to use than debit cards if more establishment will accept bitcoin. It's easy for them and for use and they can increase their income the same with lessening their workforce. It's convenient to use it.
I don't really think that Bitcoin can be easier to use than debit cards. There are already a number of Bitcoin payment cards issued by some web wallets and exchanges (Coinbase, Xapo, etc), but they are basically the same plastic cards that are in the widespread usage today. Ultimately, this technology doesn't depend on the type of the currency it is used to process. If you refer to paying with smartphones, I don't think it is a good idea after all...
Let alone the convenience of using smartphones for payment