I suspect there is a bit of a harder ceiling imposed by the fixed reduction gear between the motor and the wheels. The gear ratio must be a compromise between acceleration off the line and ultimate top speed. But the torque curve is such that these cars get to up to speed much faster than the top speed stat would suggest.
I think it will depend on the vehicle, as some cars have different trims with different power levels and it's possible that's just a software limit (hence why VW can offer more performance for a fee). On other cars, I am thinking that eventually we're going to see conversions and upgrades akin to the good old days of hot hatch tuning. You will get those that change a lot of mechanicals to get more power, and then you'll get the people who just chip the ECU.
So far, it doesn't seem like there's really much of a market for any tuning of EVs but it must be coming. The kids buying performance cars of tomorrow will be likely getting EVs, so all those in the market today doing great things with ICE cars should be preparing to transition!
