After the last two years of primarily rounding-out the list of mid-70's -- late-80's arena rock headliners (Cheap Trick, Chicago, Deep Purple, Joan Jett, Journey, Steve Miller, Yes, etc.), there's no way that the HOF is going back to the well for another 3-4 second-string classic rock acts for 2018. Last year was the close-out set.
Going forward, enjoyable, but meh arena acts like J. Geils and Dire Straits will be limited to one admission annually. With, The Moody Blues, I'm a fan; but, they'll never be admitted. As I recall, Rolling Stone once named Days of Future's Past, the most overrated album of all time (or something to that effect). Critics just hate that over-the-top, self-aggrandizing prog rock.
As for who will get in, Radiohead is a lock, and deservedly so. They'll also likely admit questionable Bon Jovi. They're just too big of an act to continue to ignore and their absence makes it harder to admit more-deserving older, heavier bands like Judas Priest, Iron Maiden, etc. from which Bon Jovi's pop-metal sound partially evolved. Despite all the albums sold in the 80's, there isn't one true hair metal band from the genre in the HOF (and, no, Gn'R doesn't count). Bon Jovi takes care of that curiosity.
The admission of The Cars, or to the less likely-extent, Depeche Mode, take care of another HOF-overlooked genre, New Wave, Post-Modern, etc. or whatever you want to call it. The Cars (initially, considered New Wave) would temporarily satisfy this inexcusable oversight, while still appealing to the HOF's arena-rock base. In this regard, despite album sales, concert attendance and critical acclaim, there are presently no acts like Billy Idol, Depeche Mode, Joy Division, New Order, Public Image Limited, The Cure, The Smiths, Tears for Fears, etc. in the HOF. They can't ignore the genre forever.
For some reason, I just think Nina Simone is also a lock. She's deserving, continues to expand the Rock-and-Roll footprint (to include, basically, any post-WWII music, excepting country), more distinctive than yet-another arena-rock afterthought, diversifies the slate, etc. I bet LL Cool J is admitted for somewhat similar reasons. Each add to what isn't fully-recognized, but should be.
Personally, I'd like to see nominees like Kate Bush, The MC5 or The Zombies admitted. But, I don't see it happening on any regular ballot. Rage Against the Machine will be admitted soon-enough on a regular ballot, I think just not in 2018.