According to what we read these days, this same Jamie should become secretary of the Department of Treasury if Trump wins, and I don't think he will think differently about Bitcoin from that position.
To me that Jamie is completely irrelevant when it comes to Bitcoin
Trump and Jamie if becomes the next President and Secretary of Department of Treasury, will have to rely on on other people to execute many things they want to do. No single person in the USA. can decide all things there and I see time for person like
Henry Kissinger gone.
I know one thing for sure - politicians change their opinion like chameleons change their colours. Maybe Jamie will also do the same and be pro-crypto, but if Trump is anti then Dimon will continue and be anti-crypto. They lines will be congruent.
Politicians, businessmen, entrepreneurs can change their opinion and business developmental strategies with time. To succeed, they are smart and adaptive people, and if they can not adapt with new trends, their companies will soon be taken over by competitors.
Nokia, Kodak are examples outside cryptocurrency market and in this market, some examples are Poloniex, Bittrex, Grayscale.
JP Morgan Chase as business must be adaptive well, else they will lose customers and their top position. Jamie Dimon can feel hard to change words on his own opinion, or he simply wants to hide his actual thinking, but for the business, he must do right things.