21st century Spanish Flu was the 2009 H1N1 swine flu pandemic. Literally - Spanish Flu was also H1N1, though the strains were slightly different. The 2009 pandemic was estimated to have sickened about 1.5B people and killed about 150,000 for the relatively low death rate of about 0.01%.
We'll likely think of coronavirus the same way we think of the 2009 pandemic, i.e. it gets a Wikipedia article of its own, an occasional historical mention, but we forget about it when disease is not specifically the topic of conversation.
The WHO gave up tracking cases on July 23, 2009, 3 months after the epidemic started, when it hit several hundred thousand confirmed cases. At that point it just became a part of seasonal flu. It's circulating again this year: in recent weeks it's been the most common seasonal flu variant infecting people, and with 19M flu cases so far this year, there have almost certainly been more deaths from H1N1 than from nCoV.
We'll likely think of coronavirus the same way we think of the 2009 pandemic, i.e. it gets a Wikipedia article of its own, an occasional historical mention, but we forget about it when disease is not specifically the topic of conversation.