Two things here:
1. Tearing. While it technically "exists" on a panel without gsync, no one can see this. THIS is tearing, what you guys are talking about is not perceivable by the eyes, and 144hz panels dont tear like in this video with or without gysnc:
https://www.youtube.com/watch?v=iklIpcGAsiQ
2. If you own a gsync monitor, you likely own a gtx 1070 or 1080 given how expensive these panels are i think that is a reasonable conclusion. How many games are ACTUALLY able to take advantage of gsync? Think about the vast array of games on the market and how many people play the popular easy to run games, gsync isnt even coming into play on a HUGE part of the games available today. Gsync is so odd in that you need to be dipping down quite a bit below your refresh rate for gsync to really be valuable, that the only people currently gsync makes sense for are people with lower end GPU's....but these people cant afford a gsync monitor!
Gsync is not a game changer, its a cool technology that makes sense on paper but in practice it is not near as big of a deal as high hz monitors or blur reduction technology.