Greetings from the shed...
How about someone who can create generative music to keep us all happy. There will be less to stream from other sources, as the internet may no longer exist in the way it did. The music will be very different each day and will just keep on mutating itself.... I'd love to build that. Though maybe Longplayer does this already???
" Twenty to thirty years perhaps?"
I can't see any evidence which backs this up at all. Other than "blind optimism", of course
Well I guess I can grow stuff - fruit and vegetables, and I have some animal husbandry experience (mostly chickens and sheep). I also know enough to be dangerous about solar pv, solar thermal and solar pvt.
I can mend clothing and do simple bookbinding.
I can provide small unit tactics and survival skills to the group. I've been secretly prepping for the zombie apocalypse.
I've got camping gear covered for all seasons and reliable water purification for 4000L. Sadly I know little about farming but I'm not afraid of manual labour if someone can tell me what to dig/plant where – I'm liking the look of Ben Green's efforts with The Barracks!
Products like http://source.co look really interesting and cheap/solar Air-Conditioning/Cooling tech seemes like it will be a necessity in the UK in not too long (unless Greenland melts in which case we'll all need heating to survive a new Ice Age across western Europe as explained in 'An Inconvenient Truth'). If anyone is working on A/C, Desalination or Solar projects I'd love to know more. For now I'm just watching lots of Tim Hunkin's engineering youtube channel and rewatching Connections by James Burke :)
With all the above said, the more I think about collapse, the more I conclude that *survival focused bartering/currency* will be the key to urban/city survival short-term. With lists like this in mind
(https://thesurvivaljournal.com/survival-kit-list/) I think there's value in stocking up on 'Dry High Test Hypochlorite (HTH)', 'Benzocaine gel (for toothaches)' and 'Whiskey' because I think they'll all probably be more useful/valuable at a community level than gold or paper money.