Let's stay.
From a simulationist perspective, we can say one of the Uchiha elders got cold feet and scuppered the deal. Art imitates life, after all.
Same thoughts.
I would actually wonder if the Hyuga would push the Uchiha into tanking this deal.
My reasoning is this...
1)We got this deal while making a HUGE statement to the village by housing about 200+ homeless civilians, which should've attracted a lot of attention and maybe a bit of prestige.
Clan attention and interests included.
2)Mari has been working her magic around Leaf whether it's building support or offering condolences to clans. And then we had the Ami further our interests...
3)The Hyuuga are probably viewing this all with suspicion. We haven't been subtle.
4)The Hyuuga also know the Nara deemed Keiko very important and a great addition to clan, enough so that the heir made a public announcement in Mist. (I'm not going into the other cynical reasons for the marriage) With this in mind, they should be wondering if we're trying to gather more support to counter their voting block.
5)The Hyuuga are aware, probably more than anyone else over what the benefits of having 2 bloodlines in a clan or tight alliances can do. (Eyeball + Control of chakra overall pressure points) If they know Mari is approaching possibly the weakest clan in Leaf, they'd have to put 2 and 2 together. It's in their interest not to let the other clans get additional bloodlines to compliment or strengthen their clans.
*On top of having those amazing eyes, the Hyuuga have the unique ability to eject chakra from all of their pressure points. Canon implies that they have 2 Bloodlines.
6) They're choking the Uchiha economically, so I wouldn't think it's impossible that somebody on the Uchiha side got cold-feet with a threat or insinuation from the Hyuuga who should be reasonably close to fishing out what the Uchiha are up to.