Well you started the charmless dash idiot offensive, so you gotta take it if you’re handing it out.
Anyway OP - I don’t imagine it will take 12 years in the end, but as the drugs available will change rapidly, it’s hard to know what the landscape will be like in a decade.
The NHS is in a fix right now, so vital though solving the obesity crisis is, it has to be balanced against all the other things the NHS has to do, compounded by the fact there’s no system associated with this as yet - eg you’d think this would be the sort of thing physician associates could look after, but they are under review at the moment.
Anyway, I think the patents loose exclusivity in a couple of years, by which time we’ll know more about how to manage weight loss maintenance - so I’d imagine this general of drugs will be rolled out in 5 or 6 years.