Campaign advisers believe public polling over the coming weeks will replicate these results, saying concerns about Biden’s age were already taken into account
Showing "no change" would be a great result, if Biden were already ahead in the polls. But, he's not. Right now, Democrats seem to be stuck in a Sunk Cost Fallacy. Sure the other option is unknown and scary. But, when the known situation is "you're fucked", the "unknown and scary" starts to look less scary.