Nice click bait title, make it sound like cosplayers are getting the blame so people get outraged and click the link. Try some subtlety in your click bait titles next time rather than an outright lie.
I don't see a connection between Cosplay becoming popular because the economy stinks. Cosplay used to be on the fringe and anyone that did it was considered weird and that stereotype is becoming lost to the past. The more mainstream cosplay becomes the more popular it will become.
Then how can anyone unemployed afford to cosplay and especially do conventions? conventions can get expensive if you get more than a single days pass, plus hotel, transportation, and food. I don't see how it is a majority unemployed doing it except during Halloween.
I think the writer of the article makes the assumption that the 2 are related when it is most likely a coincidence.