Hardly. They needed to entice early adopters. I would not have bought a Tesla had they not had the unlimited option.
It's just another step in the evolution from early adopters to mainstream. No way the "free lunch" model could work at scale - too many people take unfair advantage of the chargers (local charging just because it's free).
Now we'll see who really can and can't charge at home. If you really can't, then you use the supercharger and pay for what you use.
In my area I think $0.20/kWh would be fair. I pay ~$0.11/kWh at home so it incentivizes me to charge at home yet a 60 kWh fill up at the supercharger would still only cost $12 (cheaper than gas).