There are a lot of factors to consider. Technologically Mains-Battery-Electric (from atomic power, wind, tidal, hydro etc.), fuel cell-electric (hydrogen) or alternative combustion technology is all possible. If everything else is equal people will go for the one that is nearest to a petrol engine. Given how many IC engines exist and need to be supported in the interim, I'd put my money in some sort of manufactured diesel substitute. Based on algae, grass crops or stewed coal? Who knows.
A 50 hp Diesel bike would suit me.
It's not just the technology though. If someone starts a huge war over the dregs of the oil, we could all (or those of us who are left) be using wheel barrows.
It'll take a major event to sort the technology out. As late as the 1930's if you put out a requirement for a delivery truck you'd still get the steam, mains-electric and battery-electric people turning up. Someone bought the equivalent of Betamax vehicles and it was only the Great Depression and Second World War that brought internal combustion fully on top. I'd expect the same for the next 50 years unless there is something very good (fusion?) or very bad (WW3) out there.
Andy
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