He was already Sinestro, re-casts are a bit of a pet peeve of mine. I'd go with either John Hamm or Vin Diesel. My reasons for wanting Vin Diesel in this is because he looks like STAS Luthor and I'd like to see him in something recent that isn't Fast & Furious. John Hamm's just an amazing actor period.
Anyway this rant is illogical since it implies that writers don't have free will. Just because the mods organized more contests doesn't mean all writers participate. If encouraging writing forces blocks than every fan fic group is just as responsible. Most of the writers that do take part in those comps are active enough to publish works shortly after the comps as well. Both groups and Contest inspire the creation of new ideas which happens to be a very good thing for curing writer's block not causing it.