Sadly it is far from unique and it's just one of the of the ~4,500 exchanges scheduled to close by 2030. My own exchange has been looking a bit tatty for a while and the front door has been in dire need of a lick of paint for what must be about the past 10 years.
Technology progresses and nothing stands still in the world of IT and coms, but the exchange doesn't automatically shut down immediately after the area has FTTP and it will likely be around for a few more years yet. After full fibre is rolled out to homes in your area, there will still be homes with dsl. The majority of consumers have no idea about the technology and dont care if they have FTTC or FTTP as long as
their wifi* works. There's LLU SPs who may still have equipment in the exchange. Openreach needs to convert the landlines to digital voice and then finally dismantle all their equipment.
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*It grates when people say wifi when they mean Internet or broadband. I can excuse for those generations that never had computing or IT in their educational syllabus, yet it is often the younger generation who are guilty and who should know the difference. 
