AFAIK only Highland Wildlife Park has them in the UK now.
This is correct. The most recent collection to go out of the species was Welsh Mountain Zoo, about a year or two ago. If it wasn't for the fact HWP recently received a female, I think I would have counted this species among those likely to disappear in the next 5 years.
Almost certainly! Though it may take a number of years and a new generation of folk who have 'identified' with some other species. 'Cute' does seem the most popular theme at present, with Meerkats and Penguins at the forefront of popularity and mirrored in the zoo exhibits.
Shame there aren't really any collections which capitalise on this "cute" trend to bring back a wider variety of small carnivores! There are a good number of this group which have either disappeared from collections recently, or are on the wane rapidly. Examples of the latter include:
European genet - the only public collections with these now are Auchingarrich Wildlife Centre, Camperdown Wildlife Centre and Wickid Pets Animal Adventure.
Common Palm Civet - only a handful of mostly petting-farm type collections hold these now.
Ratel - there's now only one male left at Howlett's, and I don't think populations in Europe are sufficient to make it likely a female will be brought in.
Steppe Polecat - last I heard, still kept by Trotter's but nowhere else.
Siberian Weasel - only kept at Longleat now.