do you ever receive dollar coins?

[True Federalist (진정한 연방 주의자)]

I don't ever recall receiving them, but I do try to get them from the bank and spend them.  I find them useful for small purchases.

[True Federalist (진정한 연방 주의자)]

i think the only way a dollar coin will catch on is if we stop printing $1 bills.  even then there are millions and millions of $1 bills in circulation that will continued to be used for a long time.

Not really.  The average lifespan of a circulating dollar bill is only about five years and I seriously doubt they'd remain in circulation long if we ceased printing them as people would tend to keep them as souvenirs and the the remainder would see hard use while they were still available. I do agree, you'd need to end the penny and the dollar bill to get the dollar coin to be more widely used and that is unlikely to happen because of the politics involved.  Maybe if we switched to a zinc nickel at the same time as we got rid of the penny it would work.

[True Federalist (진정한 연방 주의자)]

... the Sacagaweas easily tarnished. I thought the current presidential $1 coins were a big improvement, which supposedly are tarnish-resistant

Since they have the exact same composition, that makes little sense.

Next year will be important for the Presidential coin series.  If any of our living ex-Presidents wants to be a part of the series, they have to die next year to be eligible for the final set to be issued next year.