Everyone needs to relax.
As soon as 5.4 comes out Blizzard is fixing this problem with connected realms. They have been working on them since CRZ and perfected them on the PTR. It is going to drastically change realms for the good, just like CRZ did. Blizzard would definitely not take months to release this cool feature, they know the playerbase has been in need of this for 3+ years now and it has definitely been a top priority since then. Despite what people say, Blizzard hasn't been abusing server transfer fees to make tons of extra money, they are in it for the customers and the customers are first priority, and they know how bad the customers want servers to simply be merged.
Just a few more weeks. September 10th is just around the corner. Your realm will be fixed and we can celebrate by killing SoO bosses.