Great question!

The short answer is, yes, it is because waiting immunity does not mean complete disappearance. This article explains, “Speculative evidence suggests that even if people are reinfected with the coronavirus, the second infection will probably be milder or asymptomatic and less transmissible to others.” Note the word speculative. There isn’t concrete evidence of this phenomenon with COVID-19. So it’s not a guarantee, but it’s a very reasonable assumption given how immunity works with many other similar respiratory viruses.