You're making two assumptions that, I would submit, undermine your argument to some extent.
The first one is no technological progress - and with it, a corrolary that the only PV tech worth pursuing is the one working at ground level, protected by a thick atmosphere. I would expect a trade-off between conversion efficiency and lifetime to be the tech play to follow for space PV pannels - meaning different materials, different ideas that would perhaps not be economical at ground level. The constraints are different up there, and in the long run we will need some sort of space-based solar energy capture tech, as there's just too much to do off-planet once a suitable jump point is established to scale down costs. Heck, even lunar settlements will need this. Moreover, for a system with high enough fault tolerance/robustness/etc, the solar station does not even have to be placed in Earth's orbit - Earth's Lagrange points would make more sense, even if transmission will have to solve a somewhat thornier problem, so lower efficiency traded of for longer lifetime could be compensated by higher illumination. Further down the road, heliocentric orbits for multiple stations and/or multiple relays might turn out to be a must, especially if humankind ends up needing power all over the inner solar system.
The second assumption is that any solar power station has to be photovoltaic. I would expect thermoelectric to be quite interesting, at least in the short term. Longer than the current launch-cost constraints, I would not be surprised to see viable alternatives that we're not even imagining yet, mainly due to the fact that 'what works well on the ground does not work as well in space' (as you already said) is not a one-way relationship - things will probably end up working well in space that would be silly to try on the ground.
The main problem, currently, is costs. When (not if) that is solved, any space-based solar power system has a heck of a potential to scale. Besides, for now any solar station will very likely be more about advancing technology than actual power generation. One needs to start with a first step in order to reach the 10th step.