Had a longer post, but realized I was splitting hairs and arguing finer details. The big issue in question is how fast the cost of batteries will come down. If battery prices keep coming down at the current rate or accelerates, it's likely demand for gas will crash hard. When that happens is hard to guess.

> I genuinely doubt that they’ll even sell gas lawn mowers by the end of this decade.

Yeah, I have a DeWalt and love it. It does burn through batteries fast though. Fortunately I have a bunch of batteries for a lot of different tools.