I'd be interested in seeing a breakdown of the lifespan of oil using transport. A car might have a 15 year lifespan so we can't see a massive change in petroleum use until that time. However boats, trains and planes have at least double that lifespan. Because of capital investments, surely an alternative to oil is still 20 years away?
Trains are feasible to run on electricity, since they run on fixed tracks and you can have overhead cables or 3rd rail configurations. There is no realistic chance that ships and planes will not use petroleum fuel for the foreseeable future.
Think about it; for most of history shipping was entirely wind-powered. Clearly not comparable to today's massive freighters, but don't rule out new technologies finding a way to harness more wind and sun at sea.
And at the end of the day if there's a surplus of renewable electricity, it can be converted into high density fuels such as gas or diesel. That technology exists today; it can only get better especially if a cost incentive existed.