Though 100cr club is not a big thing anymore, but for smaller movies it is still an achievement and even last year we saw some big movies fall short of it.
Last year also I had asked this question: http://forums.itsboxoffice.com/621505/dark-horses-that-can-enter-the-100cr-club-in-2018
From my 3 predictions, 2 were correct (Baaghi 2 and SKTKS), and the third (Junglee) moved to next year.
Some movies that were predicted by other users, like Manikarnika, moved to next year as well.
This year, I place my bets on Luka Chuppi, Chhichhore, Marjaavaan, and De De Pyaar De.
PS: Movies like Manikarnika and Total Dhamaal crossing 100cr will not really be a surprise, so predict movies where it would actually be surprising if they do 100cr.