I'd so go for creating one. As much as the NFL infuriates me, I'm also hopelessly a Vikings fan and would enjoy having a space to engage in those conversations.
Only admins are able to create new communities on Beehaw, and there's already a sports community so there's not really a need for a more specific one for a single sport. Also, I'm pretty sure there are already communities for specific sports/leagues/teams on other instances that you can use with a Beehaw account thanks to the beauty of federation!