I have been a numismatist for over 60 years. The purpose of the mint is to provide coins to trade for goods. Since the first coins the mint has adapted by retiring some coins and adding new ones. Additionally, the coins have changed in composition as ordered by Congress. Most notably was the removal of silver in our coins starting in 1964 and replacing them with a copper-nickel base replacing the metal in the dime, quarter and half-dollar. This along with the removal for our currency to no longer be backed by payment in silver by demand our Nation entered into the status of “Fiat” monetary system which the Government said the value was backed by the Government and not by precious metals.
So, in reality it doesn’t matter what the coins are stamped on. However, I fail to see any necessity to change the composition of the coins any further. I do see a time in the future where the penny will be replaced by a 2 cent piece.
As for the mint being a profit center, they already are! Proof sets, medals, and commemorative coins are minted all the time.