Rice kasi is an irreplaceable part of the average pinoy diet. It's historically cheap, accessible, goes with everything, and gives you so much kcal with a single cup.
I can't see the nearby carinderia replacing rice and ulam with chicken and kamote fries or fish and chips or nilagang baka with corn+carrots, and I also don't expect construction workers having the energy to do what they do with a lean diet.
Most importantly, it lets the BBM administration off the hook with their promise of rice utopia.