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I agree with the sentiment but pragmatically I think we have to time bans to when replacements are really equivalent or better-- electric mowers in particular are still 4x the cost and get mixed reviews, and I don't think chainsaw usage is a huge civic problem here in DC, but I don't live next to any big parks. Maybe we could also go with making new ones illegal to sell, though we'd have to coordinate with MD and VA…
Battery-powered lawn equipment is definitely getting better. I find less runtime and a bit less performance a good tradeoff for my interchangeable head weedwhacker vs. a temperamental two-stroke engine that I use once a month or so. However, electric isn't going to do the job for a sit on top mower as far as I know and, in general, professionals who are using their equipment all day long are mostly not going to find…
Also ancecdotally, a friend has cub cadet's battery-powered sit on top mower. He loves it