Just for fun, here is a topic that might be worth kicking around. My view is that electric motorcycles and their technology are comparable to motorcycles from the early 20th century. Wouldn't you like to have a 1910 motorcycle in your garage right now?
I have owned various motorcycles over the years that I hardly gave a thought to keeping, but if I had them now, I'll bet they would be worth something. In particular, I have owned a 1962 Vespa 125, a 1963 Lambretta 150 Li series III, a 1963 Yamaha YD3 touring bike (complete with leg shields) , a 1964 Honda Superhawk, a 1969 Yamaha 350cc YR3, a 1971 Honda CB175, a 1973 Yamaha RD350, a Honda 1974 CB400-4, a 1976 Honda CB550 - to say nothing of my first car, a 1960 800cc DKW (now Audi) Junior 3-cylinder two-stroke 4-door sedan. My feeling is that all of these vehicles would be worth more than I originally paid for them and would become more collectible as the years go by.
You might have to keep it a while, but I'll believe the Brammo Enertia and Empulse will be worth keeping around and passing along to your children, even as better electric motorcycles come on the market in the future. Unlike IC motorcycles, I'll bet electric motorcycles will age well, even if you have to replace the batteries occasionally. At least you won't have to worry about acids building up in the crankcase, oil seals failing, fuel evaporating and clogging passages, the piston rings and valves rusting, etc., etc.