Real post Below, but TL;DR at top: Merge OCE with US, use retail system (incl. ONLY US-W servers when cross-regioning ).
I agree with the merge. I detest the prospect of myself and other oceanic players needing to transfer to U.S servers / make alts there just to be able to get games. There are not enough players on oceanic realms to be able to keep queues going strongly, ESPECIALLY as you start reaching some of the higher rating echelons.
Implement the system that retail holds, where after a couple of minutes in a queue, you are open to region-wide queues and may be placed against teams from u.s realms on a US-W server.
The hopes of OCE arena having a self-sustaining ecosystem for PvP will be met with ruin, Merging is the only solution moving forward, else there will be even less participation in future patches to come.