Russia's economy is now - as of the latest 2015 numbers - 1/12th the size of the US economy. It no longer matters as a global economic power (it still matters as a global commodity player). Its economy is smaller than Canada's now.
China will continue to use greenbacks because they will never have any other choice, the same as they'll continue using Euros. The US is back to being China's biggest trade customer (with the dollar having gained so much value): that trade is mostly done in dollars and that will continue.
You're talking about public debt, which is a small fraction of all US wealth holdings (household + corporate + government), and can be trivially managed. Further, unlike a lot of countries, the US has significant spare taxing capability (it rests in the middle tier globally on taxation). The US could easily raise $200 billion in new annual income taxes on the top 25% and not miss a beat - that single move alone would handle any potential issues from the public debt cost. Or better yet: the US can constrain its spending growth (as it has been), allowing income and assets to continue to outrun the problem.
And of course the US owns the global reserve currency, which enables it to export inflation to the rest of the world as a means to reduce the domestic hit of things like QE (which is why the Eurozone's QE hasn't been as effective). When the US uses the dollar to improve its fiscal circumstances, the rest of the world foots a big part of the bill. While that's sort of like cheating, it's an advantage the US possesses that nobody else does.
You picked out the one thing that is the easy trump card: the global reserve currency makes it all that much easier for the US.
[1] - http://fortune.com/2015/10/14/1-percent-global-wealth-credit...
[2] - https://en.wikipedia.org/wiki/List_of_countries_by_distribut...
"Some 39 percent of the world’s wealth belongs to Americans, while Western Europe accounts for another 31 percent."
And that was before the huge asset rebound in the US, and was a drop of 12% due to the great recession.
http://economix.blogs.nytimes.com/2010/09/14/americas-domina...
Allianz's 2015 report indicates North America holds 45% of all global financial assets. Unless you're pretending that Canada and Mexico hold 20% of all global assets, your figures are wildly off the mark (Canada is less rich than the US per capita on average, and Mexico is far less so); at a minimum the US holds 40% to 42% of all global wealth.
https://www.allianz.com/v_1443702256000/media/economic_resea...
Yes, the US has debt, but if the market believes it's stronger than any of the alternatives... the US dollar still holds value.
I am very skeptical of this.
If this ( http://www.allianz.ru/upload/iblock/ff7/ff77bf0183742b88ea8f... ) is it, then you have misread it.
"Permit me to issue and control the money of a nation, and I care not who makes its laws!" - Mayer Amschel Rothschild
Secondly, the government creates dollars by spending -- when the US government spends, money is created. When the US government taxes, money is destroyed[1].
Same is true for the RBA in australia, it's even on their website[2]:
"As the Australian Government is a customer of the Reserve Bank, these payment flows can be very large. Expenditure by the Government adds ES funds to the account of the recipient (or their financial institution), while tax receipts have the opposite effect."
The US has several bizarre, self-imposed constraints like the "debt limit" and some crazy mechanism for the fed to buy treasury bills from the government that goes via the private banking system for no good reason but the net effect is the same. Government spending creates money and taxation destroys it.
In terms of ownership and control, the RBA is owned by the Commonwealth (probably the same for Canada) and the Fed is owned by private companies because of concerns about government control when it was setup (even though the Fed and the Treasury co-operate so much they might as well be the same institution) but ownership is very different from ownership of a normal company[3].
[1] http://www.mecpoc.org/2011/07/who-can-really-print-money-the...