The Heidelberg immunologist Stefan Meuer predicts that the novel coronavirus will also mutate like all viruses. He assumes that this could be the case in 10 to 15 years:
“At some point, the acquired immunity will no longer be of any use to us because then another coronavirus will return, against which the protection that has now been formed will not help us because the virus has changed in such a way that the antibodies are no longer responsible.
And then no vaccination will help either.”
https://www.msn.com/en-us/health/medical/the-immune-systems-fight-against-the-coronavirus/ar-BB12gJxx
Prof Nick Loman, a member of COG-UK at the University of Birmingham, said there was no evidence the mutation made the virus any more dangerous, with no impact seen on survival rates or the length of time people spent in hospital.
https://www.theguardian.com/world/2020/may/10/will-covid-19-mutate-into-a-more-dangerous-virus