Last time something like this happened (Lost Army), the book was just cancelled. If DC planned on continuing it, DC and/or the writer would have most likely given some notice.
I find that's just something you risk being a big GL fan. There are a bunch of different characters a writer can focus on, or--as we've seen a lot of--they could simply create a new one. They can have some bias against your preferred character or simply not care about them. Other comics characters suffer from the same problem, but I feel this sort of thing is at an obscene level with Green Lantern. I don't like that kind of insecurity where I choose to place my emotional investment, personally.
People think/thought I'm some totally irrational emotional ultra fan, but I'm a lot more pragmatic than they think. I can withdraw my investment if I don't think it's a particular secure or well placed investment
That said, I do understand the frustration, because I've been there.