Alison Bernstein, Ph.D.:
This is hard to predict. It is possible that increased diligence on hygiene and masking will help to slow the spread of flu this fall. The same things that prevent spread of coronavirus also prevent spread of flu. But people have also delayed vaccinations during the pandemic so if fewer people get the flu vaccine this could push things in the other direction. Getting your flu vaccine is still important, because keeping people out of hospitals as much as possible will help us fight COVID.
Resources:
https://medicalxpress.com/news/2020-05-covid-flu-season.html