Hey MOL! Let me explain why you're opinions are ALL WRONG...
Not really. I understand where you're coming from. For me, it was the fact that Mark Hamill has grown so much as an actor since his 20s and early 30s making the OT. The one thing I had to respect regarding Luke's character in TLJ was Hamill's acting chops.
The way he committed to, and brought life to a role he famously "disagreed" with was inspiring enough on its own. But add to this the fact that in his mind, he was not only undoing Luke, but for all intents and purposes, also saying good-bye to the character that gave him a career, and made him an icon, all in one Roman Numeral movie. And he was remarkable in that role. Even though I hated where Johnson took Luke, Mark was awesome as the isolated self-loathing curmudgeon. Respect.
All that said, I don't believe Luke is dead. I think the vanishing act we saw at the end of TLJ was a two-part Jedi exercise performed upon extreme exhaustion that involves removing your corporeal self from the Force and allowing what Qui-Gon's called The Living Force to rejuvenate the body and spirit that Luke gleaned in part for the ancient texts, and his own study and experimentation (possibly with Qui-Gon's spiritual help!).
If JJ goes this way, and can somehow pull it off in a way that doesn't come off too corny, and TLJ becomes the classic middle section of LUKE's story where heroes are beaten and at their weakest, with IX becoming a return to greatness and redemption, then TLJ will instantly be lifted to the status of GREAT movie since it worked so well in bringing me down and preparing me for triumph in IX!
I know Liam wasn't mentioned in the official cast list that came out this week or last week, but if JJ pulls off the surprise, and Luke's depleted spirit meets Qui-Gon Jinn within the Living Force, and he tells Luke his work is not yet complete, that certainly works for me (without a spec of corn)!!