I don't think anything would happen. They should just get one big sponsor per year to cover their costs and be done with it. Why not have a McDonalds or Pepsi

I don't think anything would happen. They should just get one big sponsor per year to cover their costs and be done with it. Why not have a McDonalds or Pepsi banner somewhere in the corner? Bargain branding for them, free wikipedia for us. And to limit the influence they could make it a rule to switch sponsor once a year. Why not auction the ad-spot and donate the overflow to charity?