Countries on an irregular basis establish or amend tax treaties with other countries. The Canada US treaty is now in its fifth protocol.
Although I’ll mention a few items for the Canada US treaty, the discussion is open worldwide to treaties between the US and the country of your residence.
For the moment, I’ll assume the US refuses to budge on citizenship based taxation.
For the Canada US treaty, I’d like to see an exemption for Registered Disability Savings Plans ( RDSP), Registered Educational Savings Plans (RESP) and Tax Free Savings Plans (TFSA).
Of course, the IRS would likely develop long and complicated forms for reporting each of these items, but at least there would be a way to exempt them from the US taxman.