I'm afraid some people still like to play on the old servers. We can't just close them in favor of the new ones, that would send the wrong message.
About the merge, I believe x7 will be merged after some time. Like Poissie already pointed out, it's still fairly new.
You have no point, having a year or less it doesnt matter. The x7 was already dying and the owners just kill it with the announces of the fail party servers. Best choice is merge x3/x7/x15 and just close the GF for real.
What is the point of having so many servers? 1000x, 15x, 7x and now two more? This make sense to you?