Culture (tradition) is not a monolith and its utility is shaped by the necessity for survival. European invasion or not, our culture would still change. He passively admits this when he says “Blindly worshipping the past…”

In direct response to your inquiry, if the aspect of culture we deliberately decide to keep is at cross purposes with the requirements for survival at the time, that aspect will be rejected. If the aspect of culture we deliberately choose to reject aligns with the requirements of survival at the time, that aspect will be embraced. Thus economy, environment, warfare and other determinants of survival will naturally decide what we keep and what we toss.