This is the kind of argument we used to have 2 years back. Quick comments have clearly proven these wrong, there is clear market for quick commerce apps.
I think it is really difficult to estimate the market size. I see zomato growing its revenue in 2 ways first the market (food and dining) itself will expand. As GDP per capita increases share of expenses on food and dining will increase. Another is that zomato will eat the share of dine this has already happened in tier 1 cities and slowly seeing this in tier 2 cities as well.