How long does the vaccine work?
If the disease itself does not confer lifelong immunity, then how would a vaccine?
Or do we need constant, lifelong booster shots?
People get flu shots ever flu season. Not all disease is like smallpox where one shot is good for life.
To be determined. I would say if you are at significant risk or live with those that are, consider getting the vaccine now. if you are at low risk and can live with the small but real chance of getting debilitating illness even as a low risk individual, consider waiting a bit and see what shakes out. Everyone has to do their own risk benefit analysis. For me the benefit is worth it. For others it may not be