I always love how people say I'm buying an electric car to save the planet!! If you really wanted to save something don't buy a new car at all! The sheer amount of pollution produced in making any car, in particular electric is far more than the car will ever produce.
I actually don't mind the idea of battery stuff, takes away the problem of stale fuel and carburetors you cant clean. I don't doubt its the future, I would never say its greener though.
The other thing is cost, if even china started putting catalytic converters on the trimmers and things (highly doubt it), I would be surprised if they would be able to keep it at the very low price that sells. The major brands shouldn't have too many dramas on the premium gear. If anything they might quieten some models which would be a win for contractors. I love my shindaiwa but the noise next to my ear would get old if I was using it day in day out