What a case of crying wolf. Those Gallagher brothers have done this type of thing before. Sure, it may never have resulted in an official "we're splitting up" announcement, but those two have HATED each other pretty much ever since they started the band. It kind of shows in their dismal, cynical, hate-filled rip-off-merchant music.
On the other hand if you do actually like Oasis' recent output (yes, I'm talking about you three), I wouldn't be concerned at all. Just like feuding rappers that threaten to kill each other on one album and record with each other for the next, you can bet that Oasis will also get back together at some point. It's the music industry - there's money involved.