Ed, it HAS been reported on since, and extensively so. The logic for introducing any animal has to be questioned when the animal died out because of environmental change, often human, hundreds of years ago. For it to find a place in the environment, it has to take the place of something else, which means damage, and that is exactly what is being seen. The McCartney's plan has led to one of the two major feral populations in the UK, in Kent and East Sussex, the population being centered in the 30km around Peasmarsh: the other is in the Forest of Dean, although populations exist elsewhere and tend to grow rapidly.
Much of the available data is questioned, as there are different lobbying groups at odds with each other. Should the Forest of Dean animals be culled or not? How many are there? To some extent, that's irrelevant. Let's have some facts. A sow can have up to nine piglets a year, and they come into adulthood at 18 months or so. That's a fast curve, the population can double every year.
In both America and Germany, they pose a real and current danger to humans. Some suburbs of Berlin have seen herds put entire estates under siege and attacks on humans. In the UK, to keep them you need the same Dangerous Wild Animals licence you need if you want to keep lions or tigers. Oh my! The reason is that these are not truly wild, but feral, with little fear of humans.
From a legal viewpoint, if you want to keep them, you're responsible for the damage they and their progeny do to other people's property. One boar can cause thousands of pounds in damage to a garden, and simply saying "it's in their nature" does not answer the responsibility for putting that nature where it is. More worryingly, they seem to have acquired a taste for hops: the next time the beer runs out we'll know who's behind it! And as a sign of the historic reputation, one report I've seen talks of one Kent garage having had to repair three cars in a week, damaged by boar, with one completely written off. That's tens of thousands of pounds.
As a disease vector, they are currently the primary vector for African Swine Fever in Germaany/Poland, which has meant over a million have had to be put down this last year.
So athough there is something to be said for the meat, there is far less to be said for the animal.