The NHL owns the Stanley Cup, all the teams , and the buildings or leases to play there.
The NHPLA own nothing nor even the right to play in the NHL.
FACT: While franchise superstars are not easy to replace, they ARE eventually replaced.
All the other players are continually replaced slowly every year and are therefore teh league will be replenished in 6 years.
The 'superstars' come from the DRAFT and yes it will take a few years to replace them.
FACTthe players will NOT hold out for years and slowly will start leaving the NHLPA because their careers are short and they dont want to rot in the KHL.
you need to deal with these basic facts.