I'm finding it impossible to be objective I think. So my thoughts are probably massive codswallop.
What I find interesting is that as far as I can tell (and I may be wrong) the magma intrusion doesn't seem to be slowing down, which I think means it is being fed along the way. I think if it was purely being driven by a lot of pressure from the source we would have already seen eruptions at weak points.
This (massively conjecturally speaking) magma source would either be from the mantle, which would mean rifting has started or it's from Grimsvötn. Personally I do think it is unlikely to fizzle out. However, I have no idea what sort of eruption will ensue - either some sort of rifting fissure eruption or the magma chamber of Bárðarbunga collapsing seem to be the most likely options. From what I'm reading, the longer this goes on the more 'interesting' it could be. If it doesn't stall or turn before it reaches Askja we will probably have something happen by the end of the weekend.
If I was flying out somewhere, I wouldn't cancel, but I would gently muse over the alternative options of getting home. My bigger concern is for how this event if it occurs will affect Iceland in terms of ash fall and I'm also a little concerned for the potential for winter to become very cold but this will hugely depend on the type of eruption, should it occur.