the problem is that Altis and Civic are on a higher category than alsvin/yaris/city
master motors noticed that no one is offering things like sunroof and cruise control for example, at this price range, and even if they do offer, as you suspect with facelift, it will be a top of the line city/yaris feature... and alsvin top of line is around price of their BOTTOM tier variant, and so they can take significant margin and still have competitiveness
if I could get say... 2017/8 ish corolla/civic in this price range (as some one in india could) the alsvin would never have sold this car for such a high premium... but in pakistan old cars don't have a price decrease, their prices increases! (because of pkr devaluation, but still ;p)
I really hope both alsvin, the new saga and the BAIC models, plus whatever else is coming, create a strong downward pressure in both new and second hand cars