California's ban starts January 1st, 2024. A handful of US communities (~150 as of this comment) have also instituted bans. This will drive a shift to electric blowers, and the existing combustion population will eventually age out. You don't have to ban existing units, you target the supply chain. There are no antique gas lawn blowers that will be tenderly loved and cared for as they age, they'll be thrown out and replaced with electric.

California: https://www.sacbee.com/news/environment/article277979858.htm...

Washington DC: https://www.theguardian.com/us-news/2022/jan/05/gas-leaf-blo...

Miami Beach/South Miami: https://www.axios.com/local/miami/2023/08/01/leaf-blower-ban...

Evanston, IL: https://dailynorthwestern.com/2023/04/02/city/evanston-bans-...

Oak Park, IL: https://www.oakpark.com/2023/03/14/oak-park-bans-gas-powered...