I'm not sure they can or should be domesticated, although the conditions humans have imposed on their 'wildness' is tragic. I think I read that only 1 in 5 foxes makes it past the age of 1 year due to being hit by traffic on our roads.
Meanwhile, in the countryside the horror of fox hunting is still not fully banned. How can this be?
So, whilst I agree with the people arguing that foxes have evolved as wild animals and must be respected as such, I also see their wildness as something of an illusion because of the Anthropocene, urbanisation and human 'sport' - such that foxes are forced to live as 'liminal' animals on the edges of human habitation amid roads and traffic they can't possibly comprehend and which is cutting their lives too short.
For these reasons, I feed a group of 3 foxes every night. I see it as a small act of reparation for the tragedies humans inflict on them. I'm in London. They are reasonably 'tame-ish' in the sense that they wait for me and don't scarper completely when I go out. They do keep their distance though. I don't make much eye contact close up as it can scare them and I would never try to touch them. Also I wouldn't want them to become too trusting of all humans as we all know too many humans are not to be trusted! They do recognise me on the street too, if I go out to Tesco in the evening. One is a bit lame, possibly hit by a car maybe. But they're ok and if I can make their short lives a bit easier, why not? Our cats are not scared of them at all - in fact, the cats chase them if anything.
Rather than thinking about domesticating foxes, we need to be thinking structurally about the 'other than human life' that exists in the interstices of our cities and human infrastructures. For instance, how can we keep foxes off busy roads? Could major dual carriageways and motorways be required to have wildlife fences along them?