GGB You test it on numbers rather than enthusiasm: the covers and average spend the catchment can realistically support, the rent as a percentage of that revenue, the build cost the format requires, and the resulting break-even in covers per day. A concept that only works at a level of trade the location has never produced is not a concept, it is a hope.
From How Does Restaurant Concept Development Work in Dubai? — the full reading, with the method behind this answer.