My issue with this solution is that it only solves half the problem. Unopposed Pangolin conquest of the Seventh Path is going to bite us hard on the Human Path. The most straightforward consequence of this is that every summoner, all of whom Jiraiya essentially declared to be S-rankers or close to it, suddenly has a very strong incentive to murder Keiko. It gets worse, though.
Summoners are strong ninja, and strong ninja are very likely to be part of some organization, be it a hidden village, Akatsuki, or what have you. And what so those organizations see, when they look at the state of global politics on both Paths?
An emerging superpower in the form of the Leaf-Sand-Mist alliance, with the newly formed Goketsu Clan in the center of it, and the extremely aggressive and expansionist Pangolin Empire rapidly conquering the Seventh Path with the help of unknown and revolutionary seals. You know Goketsu Keiko is the Pangolin Summoner; you've attended the Chuunin Exam tournament and seen her brother, a kid barely out of the academy, casually produce massive fireballs using his own seals, while complaining about being denied use of his full arsenal. What conclusions do you reach? And how do you act upon them?
I feel like this trajectory inevitably leads to the Fourth Great Ninja War. And while I'm sure some of us would jump on the opportunity to force Pax Konoha upon the world, I'd rather crawl out of the hole we're in right now before digging further down.
Incidentally, this is also why I oppose hunting summoners for their scrolls. Putting aside the moral aspect, I strongly doubt we'll find many who we'd just be able to kill without major political consequences. Unless you want to try to steal the crows from Itachi, I suppose.