Problem with the ToM classes was they all tried to use a new magic system, and some of them like the Truenamer just totally failed.
Now parts of the Truenamer did make it in to 4e as the Invoker, or at least some of it's fluff did. See I actually like the fluff that was behind both the Truenamer and the Invoker. But neither of them are really going to return as their own classes. The Invoker though I suspect probably more likely to return either as a specialized Cleric (though I really sure not what domains it could be), or as a some sort of Wizard school with access to the "wrathful" cleric spells.
Shadowcaster should very much be another Wizard school, they sort of did in 4e with the Nethermancy.
Binder, probably the thing with them being absorbed into the Warlock class back in 4e made the most sense, and it still makes the most sense in 5e. They just need to tweak the Warlock a bit more whenever they decide to release it again.