Replacing Crestron switches with standard switches
I have only worked on a few of these systems.
Each switch has a hot and neutral.
If you cap the neutral or remove that pigtail then the black(s) can be moved to a simple snap switch.
If you decommission everything I would put the controller and all the switches on E-bay you might just pay for all of your replacements.
The other option is switching to WiFi type switches and a hub.
These are possibly a bit smarter and can be controlled through your smart phone and WiFi.
In either case going with simple snap switches and capping or removing the pig tail or a different smarter type of smart switch and hub(s) setup should not be hard because you have hot and neutral at each location.