Every 1980's movie reboot has failed, with the exception of Karate Kid. They are NOT a safe bet, if anything, one of the worst bets to make (unless they involve superheroes) NOBODY WANTS THESE FILMS.
Anyone paying attention should have noticed that it's the in-continuity "soft reboots" that are working. (Creed, Jurassic World, Force Awakens, Mad Max) They basically make the original movie over again (a remake) but do it using a younger generation (like Creed's son, or Rey) with as many original actors as possible.
I agree TFA was just a Ep4 remake (way too much of one, way too safe) but it still can't be compared to new GB because TFA isn't trying to say the old movies "don't matter".
The trailer has a masterful line where Han Solo says "The stories are true - all of them" What he's actually saying is YOUR CHILDHOOD WAS REAL and that's why the movie went over like gangbusters. Embracing childhood, not pissing on it. Anyone who actually lived back in the 80's knows what a Big Deal the original movie was.
Ghostbusters should be the same way. Maybe the tales of the original GB are legend, nobody believes in ghosts anymore, so some women start up a franchise and meet the old team along the way. Maybe all ghosts HAVE been busted, and they're out of a job, but then some new threat shows up and the fat old geezers come out of mothballs to train a new team.
My biggest issue with reboots is we're creating a generation of content with nothing new. What if all movies in the 80's were remakes of 1950's films? Would we be salivating over an upcoming "African Queen" pinball machine instead of GB? In 20 years we'll be nostalgic for nostalgia = cultural bankruptcy. And yes, I know a couple awesome 80's movies WERE remakes, but they were from obscure sources.