By 2060, or likely well before, if solar continues down its historical learning curve, solar should be absurdly cheap, so cheap that resistive heat will be cheaper than burning any fossil fuel. We might even see artificial geothermal, where excess power is just dumped into heating rocks and water underground.
Yes PV cells will also get more efficient, but the problem of building all the factories to produce them and installing the low energy density solar farms, then storing the energy for daily and seasonal cycles and transmitting it to the population centers is a hugely wasteful process. Who is to say it is more practical than fusion. Spending a few billion to explore more economical ways to generate energy using one of the few methods that nature permits us seems like a drop in the bucket. If some optimists want to try it, good for them.
Edit: Most of the expanded PV factory production will be best utilized for industrial processes, further limiting the amount of PV available to replace baseload. https://kavli.berkeley.edu/kavli-ensi-retreat-solar-energy-f...
Applying your same argument, one could conclude nuclear has no chance, since there is limited capacity to make nuclear power plants, and those making them have been losing large amounts of money. And unlike solar, there are not good experience effects there.
Combustion turbines have also shown economic trouble lately. GE's troubles stem in part from betting on that just before demand started collapsing.
Who says solar will be more practical than fusion, you ask? Extrapolating historical learning curves, the levelized cost of solar will drop to $0.01/kWh or so by the time the world transitions to mostly solar, especially in the sunniest areas. This is vastly lower than the projected cost of energy from fusion. If you say fusion will show experience effects too, then I'll note that fusion is most like fission, and fission (as I mentioned above) has not shown such effects, probably due to the inherent complexity and long construction time scales.
An ultimate low cost for solar will excuse many sins of variability and seasonality, allowing wasteful overinstallation and inefficient long term storage.
