I'm already working at adding the option of a leading altcoin which I won't name and passing the Bitcoin fee to the users. It's just a small business but the tide is slowly but surely turning against bitcoin in the payment arena.
Yeah, let's move from a decentralized Bitcoin to a centralized altcoin because Bitcoin == banks? 
There are plenty of decentralized altcoins and some are strong enough. OP, please implement that, show the people that alts are not as bad as some Bitcoiners want so badly to believe.
Decentralized? Maybe.
Strong enough? Not even close.
There isn't a single altcoin which can come close to bitcoin. Mayyybe monero because of the darkmarket acceptance. The others are completely worthless. Vendors don't want shitcoins, they all want bitcoin. As soon as they get their shitcoin from the buyers, they convert them immediately to bitcoin. While bitcoin itself is volatile against USD and many sellers want to stay on the safe side with USD, many other keep their stash as btc. Not ltc, not eth (not a viable trading currency and its not designed to be one), not dash, nothing but btc. Btc is the ground zero for all crypto currencies. It is the tree of life. Alts are only branches of this big tree. You may have adventures between the branches but you'll come back home sooner or later.