The Prius C is a lot of money for a Yaris-sized car. Even with the tax breaks, it will still cost around 1 - 1.2m. Not all of that mark-up is taxes, you know.
Take all taxes out except the bare minimum in VAT, you're paying Php 950k for the "stripper" Prius C... absolutely no options or toys... for a car that gives you less interior space (but better economy) than a 1.4 liter Hyundai Accent. (taxi model... also "stripper"... at 600k). It will get over twice the economy in mixed driving... say 20 km/l to 10 km/l, based on what we have observed with the previous Prii in testing... so figuring this:
Price difference: Php 349,233.60
Fuel economy savings: Php 275 per 100 kms.
Break-even point: 126,994 kms.
That's a lot better than at the current price... (break even at 300k kms) and you could conceivably convince taxi operators to buy a few... but there's still the worry about battery longevity in tropical weather (which is NOT an imaginary issue... and has affected some of the hybrids and electrics here in the Philippines, already) and the fact that the vehicles still use gas.
Personally... at 1m, I'd buy one, given the cash, since I like the looks of the car and from reports, it's about as good as the previous Prius in terms of economy (new one is just too heavy with a motor that's too big)... but the technology still has to get cheaper to penetrate a market like this... especially considering that we're a diesel nation, and the advantage of hybrid over diesel isn't as big as it is over gasoline...