Empirical evidence suggests that any effort by a member of the older generation to live according to Sikhi has zero impact on the younger generation keeping their kesh.
For example, consider the 1960s Wolverhampton bus driver who was not allowed to do his job after he started keeping his kesh. That incident sparked protests. But a generation later, it is not enough to inspire his son to keep his kesh.
And then we can go beyond that and consider descendants of Sikh shaheeds or even descendants of our Gurus!