Since I now own a 300-mile range EV, and it looks like the Alta ST will never be a reality, this argument is no longer personally relevant, but I remember well my four years driving a 24 kWh Leaf. L3 charging that car was almost 8 times as fast as L2 charging it (30 minutes versus almost 4 hours) so I’d say one L3 charger is worth almost 8 L2 chargers. It can serve almost 8 times as many customers in the same amount of time.
Chademo is a dying standard, everywhere but Japan. Lots of new CCS chargers going in around Atlanta and they all seem to support both L2 and L3, at least the public pay charging stations do. Maybe businesses providing free charging to their customers and longer term parking lots like workplaces and airports will only offer L2. I think if it hasn’t already happened, soon L3 will be standard on most electric cars, but L2 will also still be standard for home charging. L1 is fine for home charging, L2 is fine for local charging, but L3 is a requirement for practical long distance travel.