Neroden, c'mon. There are over 1 billion ICE vehicles in use around the world today with the vast majority over a decade old. The earliest projections for the transition that I have read call for at least 50 years not 12.
Donn, on the projections:
2028-2030 is roughly correct for new car sales becoming nearly-all-EV. (Maybe an extra couple of years for the slowdown at the end of the adoption curve.) It takes an extra 10-15 years for the establshed base to be replaced.
For the grid to be all-solar is roughly 2028, maybe a bit later (for the same slowdown at the end of the adoption curve.) In reality 100%-renewable will be a bit earlier because wind and hydro exist too.
The "halfway point" of 50% adoption is about two years earlier than the nearly-full-adoption date, in both cases, and that's when the danger of overproduction and "maybe we shoudn't be hiring more people" starts to hit.
So the point when the Great Energy Transition is no longer preventing recessions is ~2025-2030, as I said.
I can't do projections for grid battery installs, but it seems that fewer are needed than many people think. To get a serious projection of what's needed, I'd need to have an understanding of nighttime electrical demand levels, which is tricky to get, as well as an understanding of what share wind and hydro will have in the future grid, which is also trickier than projecting the solar business, In any case, if there's a delay in that, it will only mean that some legacy natgas-burning fossil fuel operations remain in nighttime electricity production -- while it may delay getting to 100% renewables, it will have no meaningful effect on the larger economic projections.
the common belief is the global electrical grids may not even be able to handle the load of the transition until 2050 or later.
That's known as ignorance. Common beliefs used to include "the world is flat", and I probably shouldn't list other common false beliefs for fear of offending religious sensibilities. "Common belief" is not an argument. The understanding of those who are experts in the field is that the grid can adapt to 100% solar/wind/hydro just fine -- though a few batteries should be installed.
Calculations for South Australia indicate that they need about two more the size of the Big Battery -- maybe less -- for permanent grid stability and price stability. Not clear how much more they need for overnight power with 100% renewables, but they have high wind vs. solar so probably not much.