No one is advocating firing him RIGHT NOW. The question becomes what do you do if they don’t win, or at least make it to, a Super Bowl in the next 2-3 years. What then? You can’t let fear of alternatives prevent you from capitalizing on having Allen in his prime. Anything less than at least one championship is a huge failure - though I know there is a section of the fanbase that is scared of success.
McD has shown himself to be a fantastic program-builder. But he has yet to show he can style a roster to the modern nfl. He seems to need a LOT of resources to run his defense; meanwhile the offense has been neglected for years. It’s not a sustainable strategy.