The most likely scenario is that the directive is killed by the courts. The second most likely is that it's delayed indefinitely. The third most likely is Soviet-style purchase coupons that you wait like 3 years to get ahold of.
Cash for Clunkers took like eight weeks. As for trucks that can't tow - I keep seeing Rivians. Speaking as a former electric vehicle designer? There's no shortage of torque, the only limitation is range. Is the range an issue for most people? Inside EVs towed an airstream a hundred miles with the standard battery package. For the people at my kids' school who haul their RVs to a KOA 40 miles away to go glamping? That's plenty and they're the ones buying $100k pickups. Chelan is 180 miles away and I'll bet it'd be a nail-biter getting a bayliner from here to there but most truck-and-boat people do that like once, maybe twice. An EV truck is the dumbest EV you can make because the efficiency just isn't there and you're gonna get punished on the highway. The way you get around that is by stacking batteries all day, which increases your cost, which gets you a six-figure F150 which is where we're at. Trucks aren't a profitable segment because they're really cheap to make, they're a profitable segment because people pay fucktons of money for them. At that point, the expense is just another bragging point.
99% sure you intended to reply to uhsguy, so I'm tagging him here. Although I am one of those morons who overpays for pickup trucks...they keep getting more expensive and we keep buying them. 10 years ago I had a Silverado whose sticker was like 20k less than the Sierra I currently drive, and at the time it was a top of the line model, while the Sierra is upper-mid range. Shit's crazy. They can keep doing that because there's a giant tariff on foreign trucks. Gives GM and Ford a 25% cushion to work with...criminal to anyone free trade minded, though it keeps my wife's bonus cushy year after year.