worry all you want...
I think he’s a rapist and he should go to jail, but - just based on this particular case - there are a TON of process things that give him a good chance of winning on appeal. The fact that the jury asked what consent was, alone, shows that the jurors were not properly briefed on what they would be deciding. The fact that other women were allowed to testify - ones that were not allowed to in the previous trial - could be the basis for a claim that what they testified to was not germane to the three accusations (all from Constand only) that Cosby was on trial for. There’s even a double jeopardy claim that can be made based on the two separate trials.
One potential side affect of this situation is that nobdy will ever accept an immunity deal in return for testimony against someone else. Got a stone cold killer cartel boss you need to take down to save thousands of lives? Grab and underling you can charge, give him immunity and get him to testify. "Oh wait, they put Cosby in jail for life after he got immunity and they used his words against him anyway? I'll take my chances."