I am just having lore musings. This seems like the right forum to post these. Plus if I am wrong on any of these points someone will correct me. This is like my own extention of existing lore.
So we know that very little is written in larger ES lore about this time period and the only allance that has any staying power name reconition is the Aldmeri dominion. Why is this?
I believe the answer is simply that these alliances quickly collapse after the defeat of Molag Baal and the imperial threat. So I am thinking about how this might happen.
Starting with the easiest one. The ebonheart pact, this is unstable from the start between old enimies. It is currently held together by two important things. Johruns force of personality and the goodwill from the defeat of the Akaviri. Veterans of this war are currently in leadership positions and incharge of foriegn policy. This will just not be the case for the next generation of leaders it the alliance can't last even a whole generation.
Prince Inskar is shown to be quite the hot head without his fathers personality and deft diplomacy, trying to be better sure but I think the task is too great.
The second issue is that... slavers are going to slave... Dumner simply wont be able to help themselves from taking argonian slaves again. Telvanni never accepted it, Dres take non argonian slaves still (I think) and not happy about not being allowed to. I am thinking that ambitious House Halalu will break first. They will at first take slaves Illegally but as the pact starts to break they will be more defiant that will make it 3 to 2 of slavers and it will all tumble down. Why? profit... they will do it for money. Redoran is too honor bound to break and oath and Indoril too pious.
Argonians are in this pact with optimisim that they will prove themselves and keep thier freedom but when people start dissappearing from thier villages and the dumner authorities do nothing they will see that this is no the dream freedom they wanted.
The veterans of the akaviri wars will die off and the old issues will resurface and down it will come.
Second the daggerfall covenent. Again there is a comming together of old enemies. Particularly odd for the Orcs. Emeric has exemplifed himself in years of repeated wars first the invasion of the reach and then ransers war and made a name for himself in a difficult time with the loss of the Gardener dinasty.
There is a big issue with this allance. That it is based on a marriage to a forebear princess. Fahajada mentions the issues with in his own kingdom with crowns looking for any weakness. Now the redgaurd prince got captured twice. All it would take is him not being as warry and careful and the balance of power in Al'kir can flip to the crowns. With that Emeric and any children with the princess would lose the redgaurds from the allance. The breton kingdoms are fiecely independant, they have bounding together to avoid the kind of invasion they faced with the reach, but that is recent memory but any weakness from wayrest and they will start exterting indepedance again. Now I am not sure how racist bretons are but I am not sure how they'd like a mixed race king, If Emeric has any children at all do we know. There is the story of Wrothgar the deals with the orcs and thier place in the convenent.
We know there is serious tensions within Altmer society with regaurds to the allance. Wood elves are just so friendly and accepting that I think that it is hard to see them breaking with the alliance particularly with its capital being thier capital. It seems remenants of the civil wars are just too weak. I think with the new silvenar the will just not be looking to break the alliance. The Khajit however are know for shifting loyalties and I don't think they will take Altmer dismissiveness of thier talents well, the Khajit are proud of thier skill. Simiply there is tension between Altmer and Khajit here. I feel just like the other allances the alliance leader is too much of a linch pin in the whole thing. Take them out and it can be hard to see how it can last.
Anyway I should sleep tell me why I am wrong or speculate yourself about how the alliances fall.