Multi-layer security doesn't mean doing the same thing done multiple ways, for example you don't typically run multiple antivirus applications or multiple software firewalls on the same device do you? It's about layers of security: Security lights, decent locks, CCTV, intruder alarms etc.
There is nothing you outline here that doesn't make using WIFI cameras either less effective than using wired cameras OR make it no better but more expensive. If you have two cameras covering an area than would you make your best position WIFI just to lose it if jammed and only have the inferior wired feed. If you put the wired feed in the best location then what's the point in the jammable WIFI backup. You're delusional if you think burglers even think about if cameras are WIFI or not. Burglers aren't turning up and WIFI scanning to see if cameras are WIFI or not, they just turn the jammer on when they arrive at whatever home they are burgling.
Don't use WIFI cameras, if you must because it's literally impossible to network the location, AND it's very difficult to access, then make sure it has local storage that is sufficient to retain any footage from during a period where it is jammed.