I'm actually very excited to see that not all snapshotting is going, glad to see it staying on some abilities despite generally disliking it. What I'd really like to see now, as the tech is still in the game to snapshot, is a set of glyphs that would allow you to continue to snapshot, possibly with another set of glyphs that simply increases the damage of the aforementioned dots. A very high end player, or any player that enjoys the playstyle, would be able to snapshot to his heart's content, while a player who doesn't enjoy the mechanic or is simply not very good at it yet would have the option to do similar, but not as high, damage. A delta would have to be determined as to how big a gap would be allowed, say 15%, and then the numbers just need to be tuned to match it.
It would also allow players to choose to snapshot some dots while dynamically updating others giving them something to cast on the move. A demo warlock would be able to snapshot Doom if they wanted, but still have corruption update so it'll do more damage while they're in demon form. It would also let a player opt out of snapshotting on fights where it might not be beneficial or in a tier where there may not be a trinket that is good for snapshotting. I'd like to see a trinket that doesn't have a proc or on use at all, just gives flat stats all fight.
I think that in the end it'd be a good compromise, snapshot if you want, don't if you don't, do competitive damage either way.
Oh and on a partially related note, what if they allowed the new dot to snapshot? That could be the difference between it being a good talent and a great one, maybe not, but it was a thought.
Rambling on now so best be going,