Nobody is suggesting dropping us to 200 ppm. The ideal CO2 concentration is considered to be between 280 (preindustrial levels) and low 300s. It would be absolutely safe to drop to those levels.

However, even if we stopped all carbon emissions immidiately, it would take thousands of years to return to those levels naturally.

That's not what "solving climate change" is about. It's about slowing the increase of carbon dioxide in the atmosphere to levels that are more manageable and to levels that we can more easily adapt to.

If we continue with the current level of emissions we will eventually hit a runaway effect where natural feedback loops are triggered and the effects of climate change accelerate to disastrous levels very quickly and become nearly impossible to stop. That is what we are trying to prevent by lowering emission levels.

No scientists actually believe we can turn back warming in the near and medium term future. That ship sailed long ago. So don't worry, if you aren't living on a glacier right now you won't be in the future either.