If my Plaid is still running in 10 years, it will have cost me about 10k a year for depreciation. Maybe a bit more because of the track pack brakes. I really can't think of another car that really hits the high points that matter for me 99% of the time. Unless something catastrophic happens, my battery pack could realistically be in good shape even 10 years out, especially with my charging habits.
I really can't ask for more performance than it gives for daily street use. Even if my batteries degrade about 10-12%, I'll still likely have a mid 9 second car that should easily get to 60 mph in the low 2 to mid 2's. I can realistically say if they come out with something faster, I really don't need it. I doubt it will be that much faster than the current Plaid without something that doesn't rely on the traction of tires for acceleration.
Good chance it will have more power that can start to make a difference from 80+ mph but I am not that often in range accelerating hard on the street. So really not much benefit for me. I just look at the Sapphire and think, meh, I don't really care that much about its numbers. There will always be something quicker and I've found under 3 seconds to 60 and less than 5 to 100 and I am a pretty happy driver. I'll appreciate the improvements of cars but it won't make me run out and buy one.
I also think at some point the gov't will step in and put a stop to the fun. I think we might be very close to that now. Tesla could easily send out an update and limit all the cars to 85 mph and some predetermined rate the safety nannies think is safe for the road. Wealth doesn't equate with wisdom and that can translate into people doing a lot of stupid things on the street. Do them often enough and it attracts the attention of Big Brother. So while I like to drive fast, I pretty carefully choose where I let the Plaid stretch its legs.