How Soon Would Halves And Dollar Coins Dwindle If Dca And I.

I don't think half dollar coins will ever circulate again.
Dollar coins will IF the dollar bill is axed. But I think the size problem (quarters vs. dollars) has to be resolved.
And if the Feds are smart (is "Feds" and "smart" an oxymoron) they could start circulating the piles of $2 bills moldering the their vaults. I believe people would go for them; it would help alleviate complaints about the weight of all those dollar coins in the pocket.

Stop cent production; they will never be cost-effective.
Redo the nickel so that it WILL become cost-effective.
Use the half dollar for commemorative issues only; their larger size will allow for better designs than on quarters.

Unfortunately even though many of these suggestions make sense it would be too much for Congress to handle all at once.
Maybe one or two of the changes at a time.
Heck, Congress can't even fund the Federal budget effectively.

There are lots of vending machines in Australia that accept polymer (plastic) notes.

The nickel will not be profitable. The dirt-cheap MPPS (Multi-Ply Plated Steel) Canadian nickel still runs anywhere from 7 to 11 cents based on distribution costs - even the dime should be made of aluminium.

Let the panickers melt down their 4.5-cent nickels now in yet another wave of anti-government warbling, and then forget the denomination entirely.

I suspect the government is procratinating on doing anything new with our monitary system for now. They possibly forsee the end of our entire monitary system soon enough. As cross country and intercontinental trading increases, a true universal monitary system is going to become a necessity. The computerization with more usage of credit and debit cards is a much better method for usage in comerse in the near future therefore eliminating all, what is now called, cash.
OR everything will soon become a type of paper money system with, as already stated, $.50 cent notes. Picture a paper Cent, Nickel, Dime all the way to the dollar.
Or begin making currency that is changable. By that I mean sort of a computerized chip inside a paper type currency that allows someone to pay $3.74 for something, it then gets put into a machine that deducts that from a preset amount.
Or just go back to the bartering system. No cash. No credit or debit cards. Just I give you a sweater and you give me a dozen eggs.
And here is something to think about. Did you know that there are 291 ways to make change for a dollar?

Replacing the $1 note with a high-volume-production $2 note makes sense for all reasons, and it would give $1 coins a reason to circulate.

The Half-Dollar has been NIFC since 2002, and should stay that way.
Its size does make a good base for commemoratives, if not circulating coins...

Aside from the fact that completely cheapens and devalues your money thats really only the best way to make sure they end up constantly being deposited at banks.

When they started the dollar coins you could order boxes with free shipping to try and get them circulating. People figured out ordering the boxes with a credit card that gets cash back was a way for them to make money and would just keep ordering and ordering dumping them at the bank to get the free money.

There are plenty of circulating coins elsewhere in the world that are of similar size to the US half-dollar - examples include the Australian 50c and the French Polynesia 50 francs. The UK £2 coin is only slightly smaller than the half-dollar (but has a much greater purchasing power). Several European countries had coins about the size of the half-dollar until the introduction of the Euro in 2002.

When did the half-dollar disappear from everyday circulation? I've seen old vending machines in museums with slots for them, and I've seen some fairly worn Walking Liberty and Franklin halves that must have been in use for quite a few years...