So melodramatic.
Don't be drinking DiFabio's kool-aid as some form of penance for liking Terminator Genisys. Genisys was entertaining and TFA has explained things just fine.
What was the conflict in ROTJ?
1. Luke striving to become a full Jedi.
2. To redeem Anakin
3. Destroy the second Death Star/Emperor
4. Restore freedom to the galaxy.
The film ended with the heroes successful in all such endeavors.
Now, how does TFA begin?
1. With Luke a Jedi Master
2. Vader still dead/redeemed
3. Death Star/Emperor still destroyed/No planet destroying menaces for over 30 years
4. Freedom throughout the galaxy. We see no evidence of any planet being "occupied" in any way by the First Order in fact. Not Jakku, not Takonada, certainly not that Republic planet that gets taken out by Starkiller.
Nothing that they achieved in Jedi was "forfeit." A new menace simply rose from the ashes three decades later and needs to be dealt with. And the movie made that clear in the opening scroll.