How about this:
Put down a time.
Start the game at that time.
If no one joins in 10 mins, go play something else.
I don't know how many people that would message you on a Wednesday to say they want to play PS All Stars on a Friday. It sounds like setting up a doctors appointment.
If I had PS All stars on the PS3, I would probably play, but I only have it for the PSVita.
You are more than welcome to come play Black Ops 2 with me when I host

Even if you don't like the CODverse, playing with people makes it a whole lot more enjoyable.