The only way I cound see buying hoppers with little ones is if you planned on going somewhere early, back to the resort in the afternoon, then heading somewhere else for dinner, parade, etc at night. My son is a night owl who generally does not have a problem staying awake for fireworks. That being said, we don't make rope drop very often, but it works for us.
In Oct we did not hop (with a toddler) and found it to be fine because:
We went to
MNSSHP twice (more expensive than if we had the hoppers but so worth it!)
We went to Mickey's Backyard BBQ one night
We planned our park days to be in the park that was having pm EMH
So all of our nights were pretty much covered without needing to hop.
Last month, we bought hoppers and it worked for us because:
We were able to go to the BBQ again, then go to MK for Spectro that night (without hoppers we would have missed it)
We spent 2 half days at MGM so that we could see all of the shows we wanted to (the show times are set up so that it is very difficult to see Lights Motors Action, meet the Cars, see Indiana Jones, Playhouse Disney, Little Mermaid and the parade in 1 day), then went elsewhere afterwords
My suggestion would be to check the park hours, and determine whether your little ones would really stay up late enough to go to, say, AK in the morning, have a nap, then go to MK after dinner for a few hours. If they normally crash at 7 or 8 pm , then it probably would'nt be worth it.