The Superchargers will need
The Superchargers will need to be spaced a lot closer than 200 miles. Consider that Tesla credits the S w/85kWh battery with 240 miles range @ 70 mph when new under ideal conditions (no HVAC use, flat ground etc.). With a battery degraded by 20% i.e. 80% remaining, that 240 drops to 192 miles. Allowing for non-ideal conditions (AC/heat/defrost/lights/wipers, head or side winds, climbs, more than 1 person in the car, cold temps etc., and you can probably reduce the practical range by another 20%, before subtracting anything for a reserve to handle unexpected situations such as detours and prolonged road closures in low or high temps. I normally allow a minimum of 10% of the max. range for that.
Since the 60 kWh will have its practical range similarly reduced, I expect superchargers to be spaced no more than 125 miles apart, perhaps as little as 100 miles. Tesla has previously said that the first one will be at Harris Ranch, and I'd expect others on I-5 around Santa Nella, and near the junction of I-5 and Hwy. 99 to allow trips between the S.F. Bay Area and L.A.