Solar panels = Small percentage of power production Small percentage * 1.22 = Small percentage, just a shade higher.
Its not a game changer. Its just a nice development.
Efficiency improvements, mass production, and making coal internalize the cost of CO2 emissions will eventually make photovoltaics more cost-effective than coal. Once that point is reached, solar will take over a large percentage of electricity production. This might not be the improvement that puts it over the top, but I think your dismissive analysis is a little too simplistic.