npub1y62j5jea6kwmvzar07tk5arx8m8hph7gxxp5tr9f4ed0xg7ssy3sg069v6 (npub1y62…69v6) It's money-driven, innit? TV costs £0.5-3M/hour of running time to produce; movies are more like £50-100M/hour. So *nothing* gets made until the accountants green-light it, and they won't approve of anything new that isn't focus-grouped to hell, and recycling an IP with a proven track record is a safer bet than trying something new.
(FX: weeps over a pile of non-existent TV rights residuals after ~20+ years of media rights to 30+ books going nowhere.)