Because there is MMR "these days", which would prevent measles in an age-appropriately vaccinated 8 year old. Not sure about the "no one" worried, certainly the parents of the dead and disabled kids did:
^MEASLES: A dangerous illness by ROALD DAHL
Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn?t do anything.
?Are you feeling all right?? I asked her.
?I feel all sleepy, ? she said.
In an hour, she was unconscious. In twelve hours she was dead.
The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her.
That was twenty-four years ago in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her.
On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. I was unable to do that for Olivia in 1962 because in those days a reliable measles vaccine had not been discovered. Today a good and safe vaccine is available to every family and all you have to do is to ask your doctor to administer it.^
In the first half of 1961, 132 children died of measles in England - I am sure one or the other parent was worried and in the early 80ies, when immunisation coverage was around 50%, still around 12 kids (officially) died of measles per year. Would you like those times back? I would not.