But i was willing to suffer for another couple years in order to have a LT sustained roster and farm system that could truly contend annually for SCups for many years.
No guarantee your suffering has that payoff.
No indication of any sort of rebuild until the Muzzin trade. Which happened when Kopitar was 31 with 5 years left, and Doughty 29 with 8 years left. A true rebuild is not started when you have players with those contracts. Well then trade them. If the franchise is willing to eat 50% and get nothing back, sure. They weren't, gave zero indication of it, so that's that.
The "rebuild" was pretty clearly done in the service of getting back to where they were in the summer of 2018, which was trying to compete with the old Cup guys. Be it with the young guys help, or turning them into more experienced players. Whether they're 1st rd fodder or not, that seems to be what they wanted to do. Even if it's just a corporate recouping of some of the money they wasted on all the contracts handed out after the first Cup win, that's the road they chose.
Expect more of this until Doughty is even older, but possibly easier to deal when his last gasp for another Cup in LA inevitably fails and he wants out in the last 1 or 2 playoffs of his career.
Then, as you said, a real rebuild can take place, as they'll have no Cup legacy to hold onto. All 4 guys that couldn't actually lead the team anywhere, which DL always knew, will be gone. Fiala, Kempe, Dubois, none of those guys will have their numbers retired, no names engraved on the Cup as Kings, so they'll be gone. Or linger here angrily during a real tank, whatever.