Chernobyl was not a result of safety systems deteriorating over a long period of operation. We have plenty of reactors in the world that have operated for decades and their safety systems still work just fine.
Chernobyl was the result of an insane reactor design (positive void coefficient of reactivity and no secondary containment) which then had uncontrolled experiments run on it during operation. Nobody is going to repeat that bonehead move.
Fun fact, there were four reactors at Chernobyl. Only one - Unit 4 - was destroyed in the flagship incident. The other three were retrofitted after the incident and continued to produce power (relatively) safely for many years. Unit 2 was shut down in 1991 after a turbine fire. Unit 1 was decommissioned in 1996. Unit 3 was decommission in 2000 after the international community forced their hand in exchange for funding the New Safe Containment sarcophagus over Unit 4.
I believe there are still 7 (retrofitted) RBMK reactors in use today. Kursk-3 and 4, Leningrad-3 and 4, and Smolensk 1-3. Last one won't be shut down until 2034.
Chernobyl was the result of an insane reactor design (positive void coefficient of reactivity and no secondary containment) which then had uncontrolled experiments run on it during operation. Nobody is going to repeat that bonehead move.