Synthetic Oil - good or bad?

The future existence of dino oils is tied to what the OEMs require, and the ability of dino oil to meet those requirements. And of course making a profit on a product that is essentially obsolete, and is increasingly becoming so.
The most commonly warranty required grades of auto oils are 5W-30, 5W-20, and 0W-20. The lighter oils are specced for better fuel economy because of government pressure. Most will use these oils to keep their warranty intact. Dino base oil for the most part can't meet the performance requirements of API and ILSAC in these grades. Pour point, oxidation and viscosity requirements need a synthetic blend just to meet the minimum specs.
Many oils that were traditionally dino have been blends for a decade or so. As demand for these gets lower, they'll start to disappear. Small production batch boutique oils may survive. And this ignores the effect electric cars will have on the lube market, which will be huge.