That all depends on the Abramovich medical history - a family history of illness would see those odds get really long I reckon you'll probably make it to ten before Everton and maybe get to 15 before Arsenal, but I reckon Roman will have snuffed it before you close in on 20...
I dont think it is that unlikely. Extremely boring it may be but the football is effective at hoovering points. I think it depends on Jose being there. If Jose stays as long as Fergie I can see quite a few titles.