I am sure as a dr and a scientist and having read the evidence about hypoglycaemia in the elderly that it will be proven that the 4 deaths were not murders and those convictions will be quashed.
You have to know the sequence of events: The police picked Norris to be suspicious of mainly because of the dumb coincidental comment he had made. Then they trawled back over years of patients Norris had looked after specifically for hypoglycaemia deaths. Obviously they found some because we now know it is common. All of them had originally been ruled natural causes and there was no blood test evidence. Cases of hypoglycaemia where he wasn't there were ruled as non suspicious. The 4 cases were reclassified as murder literally just because he was there. You surely have to be able to see how flawed that is. It's exactly what was done to Lucia de Berk in the Netherlands and Daniela Poggiali in Italy whose convictions were quashed.
Then they used that 'evidence' to say there was a pattern and therefore he must have murdered Mrs Hall although there was no direct evidence that he did and at least 15 other people could have.
Then they made up a motive that he hated old people for which again there was no actual evidence at all. Do you reckon some disgruntled people might come forward to say he was mean to them after the conviction if a tabloid paid them enough money? Of course they would. Again multiple examples of people pilloried in the tabloid press for crimes they are later proven innocent of eg Christopher Jeffries who did not murder Jo Yeates but plenty of people were willing to come forward and say shit about him when he was questioned.
You think it's unlikely that the wrong person would be accused and fitted up? Well how do you explain that the exact same thing happened to Rebecca Leighton who was imprisoned for the crimes of Victorino Chua at Stepping Hill hospital.
So no it's NOT that unlikely that someone could be accused of a murder they did not commit and then have the police trawl back in a statistically flawed manner to reclassify natural deaths and make a person look like a serial killer. It has happened multiple times to a number of nurses in different countries now.
Poor understanding of statistics, bias and risk and poor understanding of medical evidence has led to multiple miscarriages of justice in the U.K. and around the world. It is not stupid or credulous to think this might be one of them.