I don't disagree, but that would be really unfortunate. And if PHEVs are used widely, it means a sizable gas station infrastructure needs to remain in place. And, corresponding with that, lower income individuals who street park will likely be motivated to stretch their use of older and older conventional gasoline cars well into the future.
I can't help but sense there are missing policy pieces here to do this right.
I'll counter argue to some extent:
Widespread PHEVs, even if many aren't actually being used as hoped much of the time, still gets us past the big adoption chicken/egg issue and makes private infrastructure investment without government mandate/subsidy covering most of the costs, a way more plausible thing to work with.
If I own a private garage or lot right now, I don't think there's a reasonable financial case for me to go install chargers at every parking spot unless the government is bribing me with a 90% subsidy or the like. Maybe 2-5% of my users can use them and future adoption is....in the future. Meanwhile, equipment costs money now that it's not going to earn back right now, and equipment ages. Even if that equipment is still serviceable in 2030 or 2035, it'll likely be worse than whatever I could install then in various important ways.
If we're sitting here in 2030 complaining that there's lots of cars on the road that could be being charged but aren't, it's a lot more likely that it'll be financially viable for "Chargers R Us" to be approaching the strip mall operator and offering X% of revenue if they can install chargers at every space in the lot. And it's certainly easier to get public investments going that have obvious immediate use and public demand as well. I'm sure there would be plenty of owners complaining at their legislators about inadequate places to charge, for example.
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We're talking about ending gasoline vehicle sales in 2035, and vehicles have a substantial life span. A sizable gas station infrastructure is going to be remaining through at least 20+ years from now with any of the schedule that's on the table.