Yes, 'nothing'. We are all going to get this virus eventually, with or without vaccines.

And, no. The virus would have killed mostly retired, sick people, initially creating a burden on health systems, then releasing a fair amount of inheritance to younger heirs, and lightening the burden on health systems by creating relatively younger, healthier populations

This virus would have benefited us as a whole, if we hadn't interfered, just as a deer population does better with natural predators around.

But we think we can live forever, and we think we can outsmart nature. Nothing new there.