Hub assemblies

I recently had new rotors installed and now

the shop says the hubs are warped.They said it’s not a safety issue but an annoyance issue. If i wait to replace them are they going to be a safety issue and also cost me more because I’ll ruin other parts ?

If the bearing between the hub and knuckle is worn out, the rotor no longer runs true to the brake pads/caliper. This then causes rapid wear of the brake pads and caliper slide hardware.