I think these quick no-frills vet clinics are probably the pet evolution of what's happening with CVS Minute Clinics and similar places for humans that are staffed by nurse practitioners who do a limited range of basic things.
We will likely see tele-vet-medicine apps popping up too if state vet boards allow it, as that's now already happening for human medicine: apps that let you video-chat with a random board-certified, on-call doctor to get a diagnosis and RX sent to your preferred pharmacy, without going in person into a clinic...I just got notice that my insurance now has added one of these tele-medicine apps as a "feature" and will cover the tele-consultations as "in network" now -- and while I wouldn't want it as a replacement for regular in-person visits, I *can* imagine using it while traveling if I got sick....maybe.
All this stuff is supposed to increase access. I'm not at all convinced that there's not a loss of quality with the loss of long-term relationships with a care provider, but with many people who really love their pets struggling to provide for basic care, access has to be prioritized IMHO. It means more pets get seen, get HW tested, and kept up to date on cheap prevention, and fewer pets die of preventable diseases.
FYI, the clinics aren't Walmart corporate enterprises. They're a separate corporate entity called VetIQ that seems to be partnering/renting space in stores. VetIQ is owned by PetIQ (publicly traded: PETQ), which also makes a bunch of RX and OTC generic/private label stuff (like Advecta, the generic for Bayer's K9 Advantix -- and the VetWorks pill pockets sold at Costco).
It looks like they're staffed with contract vets:
I would be that it's going to be a high-turnover gig that employs newly minted vets who are cheap to hire, with cookie-cutter-style corporate-mandated practice techniques (identical vaccine recs, little personalization, etc.). Standardization keeps things cheap (but it's not all that conducive to developing the subtle intuition that makes great vets so extraordinary).