Chocolatito, Estrada, Nietes, Ioka and Sor Rungvisai are all highly likely and all from the one division (the best one of this era).
top 100? right now only canelo. others who have a shot, depending on what they do with their remaining career are, loma, mikey, inoue, usyk. furure prospects like ortiz are too green to tell but theres some promising youngsters.
Right now only Chocolatito seems like a sure shot, Canelo might get in if he beats Benavidez and Bivol . Others like Usyk, Inoue, Loma either don't have a career defining win or enough names on their resume. However Usyk is a Cruiser ATG but since he's moved to Heavy unless he beats Joshua and some other stalwarts in the division, I don't think he'll be considered as an ATG in the broad scheme of things.
GGG hasn't done enough (although in fairness, I think he beat Canelo twice) and Crawford may never get the big fight. Crawford is certainly in the running.
Anyone who says Canelo will go down as an ATG needs to put GGG on that list too, good few places above Canelo. Old GGG beat prime Canelo twice. For me Lomachenko is the best of the post Mayweather era and will remain so in my eyes. His only real loss came where he outlanded his opponent by over 60 punches and didn't start boxing until round 7. Loma is like Messi of boxing, maybe he's not quite as good a boxer as Messi is a footballer but they are both one of a kind athletes. There is nobody out there like Loma, this can't be said for many boxers. Ali, Duran, Mayweather, Pacquiao, RJJ etc... they are the fighters that you'd look at and immediately know it's them, just by their unique fighting style, I think Lomachenko can be placed in that category. Golovkin is another one who is an ATG imo. Inoue will most likely go down as an ATG, not yet though Usyk likewise. Chocolatito I'd say Crawford for similar reasons to Lomachenko but his resume is seriously lacking, Lomachenko has at least 6 better wins than any of Crawford's wins. You can't deny his talent though, he's sensational. Controversially I would not put Canelo as an ATG. He lost to Lara, Mayweather, Golovkin x2 and his fights against guys like Kovalev are shrouded in controversy + failed drugs test. His fights against Trout and Jacobs were closer than either GGG fight.
I must say I'm surprised I'm the only one picking Taylor as a potential ATG... Unified champ in his first 18 fights, including picking up two belts on the road. Sure, he's got a few years left in him to do more and cement it, but many fighters don't get anywhere near winning a single belt that fast nevermind unifying a division.