They seem to get along famously, even with the divorce.
They have a lot of other stuff going on outside the band, and they're all supportive of each other's ventures.
I suppose anything could happen to fuck things up though. Money, Egos & Emotions can rip apart bands. Veruca Salt is a good example - BFFs have band, make great debut album, get famous quick, make really good (if over-Bob-Rock produced) 2nd album, find famous BFs, fuck each other's famous BFs and drummers and other fucking things, much jealousy and rage ensues and the girls never ever talk to each other again.
So, in the end I'm not saying that Metric has near the popularity VS had, but if Emily & James had a huge falling out I wonder what might happen?