I think we should all just take a breath and recognize that the ship hasn't sunk. As far as I'm concerned it works better this way, because Reina had bad blood with Kumiko up until they finally came to terms with everything a few eps back. You don't just fall out of love with someone suddenly.
Just humor me, and picture this:
Kumiko will probably have to date Shuuichi at some point in the future, that's a fact. Another fact, Reina will not end up with Taki-sensei. The whole plot would be completely derailed and butchered if that were to happen at this point, and the writing is too good to see that trainwreck through. But think about the three endings and see how the story would have to play out for each one.
1) Kumiko x Shuuichi
-Shuuchi would have to resolve the relationship and issues he's created and start at step one, and this would be in spite of Kumiko's close friend liking him. Reina loses some focus due to the necessary component of allocating a significant amount of time to Shuuichi.
2) No relationships.
-As expected, Shuuichi and Kumiko have no chemistry and just cannot resolve differences. Reina continues to be Kumiko's closest friend and they continue to live their lives.
3) Kumiko x Reina
-Reina realizes her liking Taki is more of idolization and admiration, and notices herself falling for Kumiko. Kumiko figures out about this, or at least finally seriously considers it, so she also realizes herself that she reciprocates.
Now finally, genderbend either Reina or Kumiko and their respective love interest. Go back and consider each option once more.
No matter which way you swing it, number 3 comes out on top.
What does this mean? Basically, yuri isn't dead. The rest is up to the writers and director at this point. I don't think we'll see Hibike revisited for at least a year depending on sales (especially since KyoAni has much more attractive options to make another season out of). So at that point we'll have a much better grasp on how the source content transpired and what KyoAni will be able to do with it. Considering that the show's romances are not even secondary focus on paper but that it also is what binds multiple people to it, they'd be much more inclined to commit. Because the only reason they wouldn't is if they were seriously opposed to anything and everything homosexual (which as I've said before, they're not)
This is speaking from a purely objective, economical standpoint projected on an objective, plot-focused standpoint.
So fume now while the passion runs high, but in a couple months when things have cooled down make sure to breath and think about this.
/essay