EV's have come a long way in 15 years or so. First ones I drove were in the car pool at work. A Toyota Prius when they first came out in AUS back in around 2005, and then a Honda Civic, around 2009. From memory, the Civic was a class above the Prius - after all, it was a Honda.
Test drove quite a few EV's (full electric, plug-in hybrids & normal hybrids) when looking for a new car for Helen (although we did settle on a diesel Kia Sportage - still waiting for delivery after 7 months).
In my view, 10 to 15 years as seen some huge developments in technology, probably in terms of electric motors, batteries and management systems. If the (seemingly exponential) improvements in recent years are any guide, just the next 5 years will probably result in Ranger / Hilux type 4WDs and trucks that'll be more than capable of 1000km between charges, even towing a caravan.
Not sure if there'll be motorbikes capable of such distances, but I'm guessing 500km will be considered adequate. I'd be pretty sure that manufacturers wont be designing motorbikes with Far Riders in mind.