Admittedly, the problem is that this limits the app to being regional. Either the company would need to open offices in major cities, or studios could contract with the company. I think it's feasible, but would limit the audience.
The benefits for the user would be incredible, in my opinion. One of the reasons I quit online dating years ago was because I was already wasting tons of time on them, but I felt like I was having my face spat in every time I scrolled/swiped through photos and half of them were annoying instagram filters, or duckface, or people sticking out their tongues, etc. Of course there's people who don't look like their photos. Moderating this in-person eliminates these issues. It's also a revenue model for the dating service, as I'm sure there could revenue could be shared between studios and the service.
I also like the idea because it would reduce the number of users who aren't serious. You'll always get people who use online dating because of ego-stroking or because they think it's "funny", but fewer of those people will bother if they have to get their photos taken.
This is probably the top idea in this whole thread so far.