postpone 11 months!? If they've been up there 3 months already, they'll develop serious health problems if they're up there that long.
Valeri Polyakov spent fourteen months on Mir with no major health effects (he walked out of the Soyuz after it landed), so postponing for a little while won't be too serious. I'm sure their families will miss them, but it's all part of the job.
As for re-boosting the ISS up to a higher orbit, they usually use the unmanned Progress craft to do that, although the Zvezda module has it's own engines as well.
Moving into the realm of complete conjecture, I think that the Russians will do their best to re-certify Soyuz as quickly as possible (even if that involves finding another 'saboteur'). Whether that will mollify NASA or ESA enough to allow their own astronauts to fly on it again is another matter.