Mercedes just announced that they will cease development of combustion engines to focus on EV's. VW Audi Group just said that this is their last generation of combustion engines. I suspect we'll see similar announcements from other manufacturers in not too long.

We may see some countries soften their goals, but I think if some of the big automotive players commit to having products available to meet those goals, there won't be much need to relax the goals. Only things that would cause a rollback is if anti-environmental politicians get into power or governments attempting to protect domestic car companies that are late making the shift.