You can't regenerate something that isn't their. That's why I say amaterasu would be great against the summons. But I do agree with you, worst cast senario the bodies keep burning. But that all depends on the speed of regeneration. If amaterasu can burn the body faster then it can regenerate then amaterasu will make an ideal jutsu against the summons. The problem with amaterasu are only, sasuke, itachi and most likely madara knows how to use it and at the given moment they are on the same side as the summons ( at least thats what we all think).
Ive been trying to find jutsu's that will be useful to fight Edo tensei ive created a list.
1st. Yamanaka Clan Jutsu's: Body switch and mind transfer jutsu's
These two jutsu's can play a major roll if they can take over kabuto's mind or body. Side effect ( if the clan member misses the body switch, it will take a while before their souls get back to their body)
2nd. Uchiha clan susanoo, Amerterasu, and Tsukuyomi
If Itachi temporarily breaks free of the jutsu, he can use susanoo to seal the souls. Because he can't approach kabuto face on without kabuto erasing his mind using Tsukuyomi is out of the question. Therefore, sasuke will have to be the one to use it on kabuto. With the nature of Amerterasu, its a possibility it can burn the bodies faster then it can regenerate. Side effect ( body will continue to burn and possibly cause amerterasu to spread to others)
3rd.
Danzo's Ura Shishou (body sealing technique). This would have been a great jutsu to use against the summons or kabuto, but because hes already dead it wont play a huge roll in the war unless someone has a similar jutsu without the huge side effects to use the jutsu (death).
4th.
Nara clan: with their shadow base jutsu's they can temporarily stop the edo tensei summons. Side effect ( jutsu can only be maintain for a short period of time, loses strenght in light)
5th.
Kekashi MS (God of majetsy) demension warp jutsu. The jutsu can be useful, but the side effects puts a huge toll on kekashi. Side effects are ( number of times he can use the jutsu, the distance he can move that object, the jutsu leaves him very fatigue which can put him in danger)
6th.
Death God jutsu: we all know about this one.. The 3rd used it against 1st and 2nd hokage. Huge side effect (jutsu user dies after jutsu)
7th.
Soul sealing jutsu's: Even though we have yet to see any, we have seen similar jutsu's being used , but not on a living person. for ex, the bijuu sealing. The bijuu sealing varies from villeage to villeage, but if they can use it on a bijuu why not on a living soul? side effect ( time to prepare the jutsu, user face danger due to remaing still to seal the souls of choice)
8th.
Yamato wood element: Although hes been caught, his wood element technique would be useful. side effect ( kabuto can supress the 1st powers)
I can list some more, but to lazy

feel free to add ur own so we can have a list of possible jutsu's that can help fight edo tensei :flaw: