The human rate of natural selection and thus evolution is like a turtle compared to the influenza cheetah, and thanks to our medications and vaccines, it just makes them evolve faster. So paradoxically, we are actually helping them by killing them. Which might mean that the less we intervened, the less harmful they will be. Take for example syphillis in the middle ages, back then it was a 99% fatal disease, but now it is almost benign and treatible except for a few side effects
Now Influenza is one deadly and nasty virus, its 3 RNA strands allow it to recombine in countless ways. This allows it to easily bypass the species barrier and thus able to reside in a large amount of hosts.
Also, does anyone know how the r. transcriptase enzyme works on the 3 strands? and how it assembles proteins after injection into the cell?