I can understand being upset that they're removing the marriages and such from the new universe, but really it does make sense. If you're given the oportunity to wipe the slate (semi-)clean, then it really makes sense to me that you would restart the relationships.
I'm not upset by it. Just more amused as another comic marriage is magically dissolved.
Then again, it isn't the first time Iris was out of the picture. Back in the 70s, Iris was killed (but not really) and Flash moved only to almost marry another woman. Gasp!