Sorry, extending the length of the con will not fix anything. The root problem is there is too much middle-class money chasing too little upper-class real estate. This isn’t a temporal problem.
Steps away from the convention are 8,000+ homeless people in San Diego. Throughout California homelessness is rising and rising. The rich con-goer can’t fit into the nice places, the poor can’t find cheap places.
I find it deeply sad that so many people pay money to go look at fictional children’s characters when so many real humans, and many children, suffer nearby. I’m not talking Mexico border nearby, I mean San Diego nearby. The good part is suffering is spread out, the rich in comic-con lines and the homeless for shelter.
You’re right, it doesn’t have to be that way. But you can no more fix it by making the comic-con longer, then you can fix the homeless by giving them more time to find a home.