They'll still require chains, sprockets, controls, tires, suspension work, etc. It's only the engine where maintenance will be less (not gone, just less). For that matter, show me any high performance vehicle driven by anything where modification isn't part of the game. It will just be a different type of playing around, but if you like spending time working on things it's not going to go away. But, if you like gas motors that's certainly fine, I do too but I think electric has advantages and if the batteries ever get there, they have a role in vehicle propulsion.