I'm not sure you have a full view of how things have and will be unfolding.
Even if there is a cure, the demand of these tests will continue. It will take a long time to get the cure to the general public. Some have even referred to it as one of the biggest distribution challenges that humanity has ever faced.
But even if this was not true, there are a lot of variables that can derail vaccination to everyone. For example, people who will refuse to take it because of lack of trust or simply because of safety concerns. I think it was the CEO of Pfizer that said the other day that complete vaccination will be attainable only until 2024.
Antibody testing will undoubtly continue to play a critical role in the fight against COVID-19, whether there is a vaccine or not.
ABMC has pleanty of time to continue to do its part.