I would have to believe that some level of modification and performance enhancing options must be on the horizon, but from what I understand there are not any currently. I can't comprehend that any major auto/motorcycle company would completely alienate all the aftermarket companies that support their vehicles much less their own accessories/upgrade department. I've rode Harleys for 35+ years, they make more from accessories, performance upgrades, and clothing and marketing than the bikes themselves. As we all know on this forum, performance upgrades is a huge market that employs a lot of people and keeps it fun. There would really be no need for the performance section if you can't make different levels of mods, whether you do them yourself or have them done at a respected shop.
I don't see the EV's in the same category as ICE autos. The performance market for cars grew naturally. When cars were a new invention, the first hot rodders started not much after that and they sorta of grew together organically with the manufacturers occasionally taking cues from the rodders to make their cars better. It grew because even though the manufacturers liked the win on Sunday, sell on Monday and the bragging rights of putting out the hottest cars, the engineering section was still held back by the corporation bean counters which left cars that were relatively easy to modify and make faster, and everybody wants to go just a little faster. Fast forward to modern times and you can buy a car that easily out performs most peoples skills and abilities. In fact you can buy cars that could be considered down right dangerous. How many roads can legitimately hold our cars power on a full-on max acceleration attempt where traction is not an issue? But we have cars like ours because they appeal to us. We know they are dangerous and they have evolved to be what they are because we have driven them to it.
Now the EV's are different. The car is no longer new. The people who are pushing the EV's for the most part aren't car guys. They are more akin to activists than enthusiasts. Their invention is designed to be a killing blow to the ICE and the traditional car. They are not building and evolving with the market. They are trying to redirect the existing market. They have taken a modern car and said, what do we have to do to beat it? Being fast is one of the bench marks they came up with. So now you have refrigerators that can legitimately run 10's with no mess and no drama and no excitement. Face it, most regular people do not want to go that quick so I don't really see much of a market for trying to get them to go faster and since they are already faster than most cars there is no incentive for them to hot rod. I'm sure some individuals will hack the system but I don't see much aftermarket support for EV performance. After all, an EV is just an appliance and I don't see anyone hot rodding refrigerators.