I was wondering if anyone ever proposed extending the presidential dollars to include Carter, and found this: https://www.congress.gov/bill/119th-congress/senate-bill/633/text This, if it ever passed, would just indefinitely extend the presidential dollar series, covering any president not already honored, and their spouse, within 3 years after the time they died, rather than requiring a separate piece of legislation for every president. But last I checked it hadn't even been voted on in the Senate, it looks like. But it's possible it might be re-introduced (or another bill that does essentially the same thing might be) eventually. Anyway, just thought it was interesting. This might be old news though, and so far no action has been taken on it.
Coins are pork in the budget, paying artists fee's Etc. is expensive. I am hoping for more out of our politicians.
The Mint is one of the few government programs that's actually a net positive to the budget. This might not be true for each individual coin program but the net activities of the Mint not only funds itself, but produces a net profit. They sell their circulation issues to Federal Reserve and their other products to the general public for more than they cost to make. Not saying every coin they make is one I'd want to buy, but the Mint is not a drain on the budget; quite the opposite.