You won't be keeping the USD as the global reserve. Trump wants his cake and to eat it, but that position is likely unsustainable long term anyways. Mind you, the role of reserve currency today is larged hoisted by the rest of the world onto the USA, there is no rule dictacting its role. But the thing is anybody who is large enough to support it (EU/China) dosen't want that role either, lest they end up deindustrialising like USA.
The actual alternative, with the so-called multilateral "Bancor" and the International Clearing Union as originally proposed by Keynes works via directly controlling exchange rates to punish surplus nations and provide relief to deficit nations. Well, it's for that reason there isn't a serious effort to create it from these other nations, which leaves them at an impasse. That's why as much as I hate to admit, Trump may actually win here because other countries don't really have any good options. Unfortunately the USA is playing a necessary systemic role here that nobody else wants to do.
The actual alternative, with the so-called multilateral "Bancor" and the International Clearing Union as originally proposed by Keynes works via directly controlling exchange rates to punish surplus nations and provide relief to deficit nations. Well, it's for that reason there isn't a serious effort to create it from these other nations, which leaves them at an impasse. That's why as much as I hate to admit, Trump may actually win here because other countries don't really have any good options. Unfortunately the USA is playing a necessary systemic role here that nobody else wants to do.