tell us how guilty you feel about the new camera after you've run 100 rolls through it :)
Resistance is futile, you are being assimilated.
Use that 6x7 for a few months and then see how you feel.
My MF addiction started with a Rolleiflex that was my only MF camera for about 25 years. Then I got a deal on a Hasselblad. Then a Fuji 6x9 rangefinder. Sold the 6x9 because I didn't use it enough and I never bonded with it. Bought more Hasselblad gear. Not too long ago a friend of mine got me hooked on cheap MF cameras. I now own two Agfa Clacks, a Zeiss Box Tengor and a folding rollfilm camera. One of the Clacks is going to become a pinhole camera.
My most-used camera out of the bunch? The Rollei. It's easy to toss in a camera bag for a short outing. Most flexible? The Hasselblad. Most fun? Any of the "junk store" cameras.
Enjoy the ride!
I enjoy a Rolleiflex, Yashica, and Holga. Haven't got into Hasselblads or rangefinders. thankfully. MF can be a gateway drug to LF as well. I'm pretty much done buying MF gear as I've got what I want, but still buy and use plenty of film. I'm about half MF and half LF for film use.
As recommended above shoot the Fuji 6x7 for a month or two and see how you like it.
If you don't like it then sell and figure that any money you lose was a cheap rental fee.
I have done this with both medium format and large format cameras and lenses. If I think I will like something better than what I have then I buy it at a good price if I can afford it (no Mamiya 7's or Ebony 4x5's :D). I'll compare both cameras and keep the one I like the best. Sometimes I lose a little bit of money but it's worth it for the knowledge and fun shooting something different.
I think you would have regretted not buying it even more.