It's crazy how if we had all managed to stay away from each other for roughly a month, we might have eradicated the flu and possibly the common cold as well.
I mean if you also separated all the other animals that can get the flu from each other, including most mamals and birds, then sure, you might be able to get rid of the flu that way, but good luck actually doing that.
COVID mortality basically dropped to a rarity with the vaccine. You can also check public data and see the population of non vaccinated against vaccinated. There is plenty of data to show the vaccines are working. Don't trust the talking heads, check for yourself!