Yep. Or you could leave the gas unhooked while not in use. Then turn it on at a low pressure (~5 psi?) when serving, and then when you are done make sure the keg is purged and free of pressure. Sounds like a PITA to me.
FWIW I frequently bulk age all my Italian reds in kegs. The above procedure makes for very quick and easy taste testing but I wouldnt want to do it for an entire keg.
I have c02 gas canisters I use to dispense my beers , the large ones not the small one time chargers, and I won't prime the wine just when I need to dispense. Which like my long serving ciders will end up flat 10 seconds initial burst. I suppose! Fizzy red wine! Is that sangria but full on.