I think it would make for a better movie if they included all those things EXCEPT for the Kessel run, and just either alluded to it or left it dangling at the end, something like: Final scene is Han has to smuggle something really important, and has an impossibly short time to do it or there will be bad consequences, and he is being warned that NOBODY could possibly do it, and he smugly says, "Never tell me the odds," and the movie just ends at that point, or something like that. Yeah, fans would probably rage endlessly about "WE NEVER ACTUALLY GOT TO SEE HAN DO THE KESSEL RUN!" But who cares? It would be a better film.