Well, that very subjective. For some, GT7 matters MUCH more than Alyx, and some of the other games too.
To me, for example, Behemoth, even without having seen anything (just because I know what Skydance is able to do in VR), is definitely more appealing, even only for the kind of game. But I could do many other examples.
Obviously having Alyx also, which is one of the most well designed VR games, would be great. But far from decisive, outside some people. Surely not for those who just read someone else speaking about Alyx, and just repeat it to appear informed and expert. That's a common social phenomenon, but they are not really interested, it's just a thing to try to feel better.
Those really interested in Alyx probably already played it on PC. The few that are REALLY interested in it and that consider it a killer app, cannot be a number that can significantly switch tides for PSVR 2. It has to walk with its legs, one step at a time. There will not be a single game which will allow a magical jum of one kilometer. More in general, it's a marathon that spans over several generations. Nobody at Sony is especting for PSVR 2 to have a big attach rate. It's just a serious step towards a potential big market in the future. And contrary to MS, they do research and development to grow in know-how and technology, instead of doing nothing and simply buying who has already did the work.
The only thing that I hope is that they will continue to support VR generation after generation despite the small market, until the technology Valve has cited, the one capable to completely suppress motion sickness, will be certified and implemented. At that point all the restrictions on movement and gameplay design and on comfort, will cease to be, allowing to unrestricted development and enjoyment of the VR space. And that will be the beginning of widespread adoption.
At that time, expertise on VR and technology will also be mature enough.