Well, unless we develop a vaccine for THIS particular flu, it wouldn't make any sense! Usually, there's too much lag time for a vaccine to be developed when it's really needed.
Also, I was listening to a radio program on the way to work yesterday arguing quite convincingly that the apparent good effects of seasonal flu vaccines on at risk groups is an artefact of the fact that those in such groups who choose to get the vaccine are in better health, and don't die as much at ANY time of the year. That is, the so-called vaccine effect is present when the flu isn't.
IF this is a flu pandemic, and IF a vaccine is developed before the flu dies out, I will certainly have THAT vaccine, but I don't plan to worry about the seasonal flu vaccine.
Dunno about compulsory vaccines....we used to have to have TB screening when I was a weelowan...but I doubt there'd be time to organise such a campaign, even if a vaccine is developed fast enough.
If it's a pandemic, it'll move pretty fast, and a lot of the folk who would organise such things will be home in bed being miserable, or maybe even dying.