Refusing US currency won't attract tourists
I have just returned to the USA, having spent a six-week vacation in Ireland. It was a wonderful experience except for the difficulty of having $100 notes exchanged for euro.
On two occasions I was refused by two separate Irish banks and the only way it could be done was to go through the account of a relative with an account in that branch.
As a visitor to your country, I was expecting that my foreign currency would be welcome and felt offended that it was not.