Most AM stations will likely all be gone in a few years. The equipment and towers are reaching end of usability and are too expensive to replace. CKSL 1410 is already gone due (officially) to equipment replacement costs. A lot of similar stations shut down their AM counterparts years ago. It's getting to the point where the land the AM towers reside will soon be worth more than the station itself.
It's not like London broadcasters will lose market presence by shutting their AM stations down. All of the London AM stations have sister FM stations and have for 40-50 years or more. Some broadcasters own more than one FM station in addition to the AM station. At one time, it was a case of AM broadcasters launching FM sister stations, even at a loss, to make sure they didn't miss out on the rising popularity of FM. It was a golden age for FM listeners. Many FM stations had 24 hour music formats with no commercials. A decade or two later FM overtook the AM marketplace, both in listeners and ad revenue. AM stations now struggle for an audience.
A case in point is CHLO-AM, St. Thomas. 102.3FM was previously 103.9FM, 1570AM before that and 680AM originally. The AM station was shut down shortly after it transitioned to FM. As CHLO-AM, it was a tiny "me too" station that mostly served St. Thomas and the rural counties around it. After switching to FM and rebranding as "The Hawk", it became the most popular station in the London area. Other stations quickly rebranded and changed formats to get in on the popularity of the "new" classic rock format. Due to its better signal and financing, CFPL 95.9FM quickly gave The Hawk a sound thrashing in the market and CFPL's owners ended up buying 103.9FM a few years later.