My guess is the Cstore is a viable niche long term, in spite of the impact of EV and declining fuel sales.
Anecdotally the 7eleven near me has constant lineups, but the vast majority don’t seem to be fuel customers.
The ABC stores I visited in Hawaii seem to be very busy mostly without pumps.
My guess is the number of service stations has been declining anyway due to land availability, municipal approvals and for other reasons. Couche Tarde recently bought Circle K in Hong Kong, and considering land constraints there, the stand alone cstore must be viable in their plans.