nope...
rule #1 about electric guitar wiring: never, ever, disconnect the signal to the amp. If you want to shut the signal up, there are other ways to do it like the one I show in this thread... this way you will never get the "accidentally unplugged guitar buzz problem"...
the way you show is the same as sending hot to ground at the jack.
whats the deal with disconnecting the signal to amp ? (its not actually disconnected its just shorted) it wont break it, theres no high voltages, its not dangerous.
so why is it bad to connect it to the output jack ?
theres already tutorials on here that show killswitches wired this way, ive got schematics for wiring guitars with killswitches off the manufacturer that show them wired this way, so whats so special....
http://alexplorer.net/guitar/mods/killswitch.html
that shows the right way and the wrong way to wire at the output jack.