Moreover, we must look critically at the approach as a continuous booster program year after year isn’t feasible either until we fully understand the impacts of the vaccine. The reality is that the current batch of early-stage vaccines on the market have durability challenges over time. This is normal as no such vaccine product can be perfect in the fact of such a highly mutating pathogen.
This is inaccurate, even given the current uncertainty.
The delta vaccine protection reduces over time, as for example the Flu vaccine also does, because no vaccines have a permanent effect, and some (like Flu) tend to be short lasting.
That is entirely a separate phenomena from the fact that the current vaccine works less well against delta than against original COVID.
We use Flu vaccines in spite of the need for a new shot every year - it is likely the COVID will be the same - though nothing is certain and one thing COVID has done is to push forward our development of new, better, vaccine technologies. So who knows?