I'm not totally sure what your question was.
My post was really pointing out that keeping a V8 and adding electric assist is going to cost some serious coin.
All I see are $$$$ thrown in front of the price. The S650 will already be more expensive due to inflation. A ecoboost V8 is going to add mega $$$ to the mix. When the base GT starts becoming the same price as a base corvette....you've got a problem.
As for the EB V6, I just can't see Ford...
The original mustang would score a God awful crash rating by today's standards. It didn't have to carry aribags, the abundant electronics or additional structure that today's cars are required. It wasn't demanded to have the structural rigidity that today's pony cars have.
Think of it this...
Considering it's available today, I would say closer to 5 years.
With that said, we are a long...long...long ways off from mandated fully autonomous. To do so would require making said vehicles affordable on the used market for lower income households.
Not anytime soon. The US has a totally different infrastructure. The sheer distance between major cities here and the lack of widespread public transportation dictates the type of fuel that is required. Until quick charging is reduced to minutes instead of hours (which isn't going to happen...