This is not necessarily a bad poll for Fetterman.
Not a good one either. What's so probablematic, imho, is the tendline. He needs to halt or ideally reverse the dynamics. Sure, the margins well above 4-5 pts. were never going to happen, but if the polling average is tied or close to tied in the morning hours of November 8, I'd be very concerned.
If Fetterman goes down, Dems probably lose control over the senate since CCM is probably not holding on (and Warnock can't be taken for granted either). After that, unlikely Dems regain a senate majority again before 2030.