I am not sure it's a matter of how you frame the issue, to be honest, although I have seen this argument used quite a lot.
100% renewables is the exact opposite of "100% non-renewables" and that's including also oil, gas, etc. So "coal" is only a part of the 100% non renewables, but it seems your goal is to get rid of all the non renewables.
And here the question is: why would you want a single goal? Why 100% renewable?
What drives us should be: save where it makes sense, don't where it doesn't. Iterate every 10 years and recheck.
All these single radical goals are literally killing our economy and society. And I am not just talking about coal free or renewable.
Even the "let's tear down the windfarms" is dumb because it's radical and non sense.
Or unrelated, even this "we need to digitalize everything" (although given our jobs we would profit the most) can lead to a lot of problems (privacy, security, etc).
I don't know why we have become so radical in the last 20 years.
> And here the question is: why would you want a single goal? Why 100% renewable?
Overlapping goals can coexist on varying time frames.
Setting aside nuclear (technically not "renewable", but also not carbon-based, and very energy dense) the goal is to stop releasing CO2 into the air from energy generation and return to pre-industrial levels.
This is because the surplus of CO2 generated so far has already caused clear and undeniable problems (not all of which are yet fully realized), and continued excess will only make things worse.
> What drives us should be: save where it makes sense, don't where it doesn't. Iterate every 10 years and recheck.
Solar is already economically competitive in many places and is expected to improve further.