If it has good HQM stuff and more of an adventure than building, something like ME^3 than sure people will play it, but don't expect to much popularity since most mods are old and have been run through. With out the new changes happening in 1.7.10 it may get a bit bland for most people, quickly. If its not that hard to swap to 1.7.10, I would recommend taking the time to do so, but don't strain yourself since most stuff is still in beta/alpha.
note: people are stuff talking about crash landing and playing it/ youtubers like gaming on cafeen is still doing a series on skyfactory so yeah still love for 1.6.4