I dont think mom and pop websites and business will go the extra mile after first learning about and implementing bitcoin and then have to go to the extra trouble of adapting to other protocols. And yes, there will be exchanges that will set aside the resources to take this on.
They wont have to go the extra mile, payment processors will just add a Monero option
Do you mean it is quite easy to add the monero payment even though it is anonymous coin? No extra effort is required?