I am one of those who isn't too worried about appeals, which presume a conviction. If he is convicted, he'll be behind bars awaiting his next trial. The appeals will cost money. They will go slowly. And it's doubtful a new trial will be ordered merely because an attempt was made to introduce something from 15 years before.
Then he'll get his sentence(s) for the financial crimes. This guy isn't getting out and part of the community drama is that various parties want to testify to the kind of man he is: cheater; embezzler; forger; thief; hirer of gunmen to aid in a crime cover-up, etc.
In addition to killing his wife and son. While motive is unnecessary, many have now been introduced.
I think there will be more forensic evidence in the last inning of this trial. But there's a lot already.
Oh - and one them (he's a liar) threads through all of this. He *was* at the kennel that night - just minutes before the murders. He did *not* arrive when he said he did. He tried to get his mom's carer to support his alibi, it was awful to watch/hear. He hid evidence at his mom's house, when she was unable to know what he was doing.
Yep, there will be an appeal, but he will be convicted on the evidence and this trial will not restart merely because of the judge allowing witnesses to speak to his (concurrent) criminality.