The PF (at least on weekdays) was pretty dead on the EU-catacenter (even before the split) past ~1am on weekdays, so if you're already having trouble now (which is understandable if you're playing during time when most people on your DC are actually asleep) I doubt it will get much better...

In regards to the game being dead for you: Have you considerd moving to a server where "late at night" for you would translate to "midday/early evening for everyone else"? Latency might suffer a bit, but maybe thats a price worth paying to keep queues at an acceptable level.
In regards to the PF you also need to consider that we're at the end of the expansion, so unless you've been observing this dead PF for the past years, I'd factor in that a lot of people have no need for PF-groups anymore right now.