There were more people on this board not going with the intelligence assessment of SOME western agencies and even more have joined the bandwagon soon after, once the Russian blunder began to emerge (this took days, not weeks). And I still think Ukraine will drive Russians out of Ukraine proper.
The only part I partly agree on is Crimea being a wild card, like Russia in earnest threatening WMD before Crimea is rolled up. With WMDs taken out of the equation, I am sure Ukraine with all the support it has will also regain Crimea. The thing I don't really know is the time it would take. I don't know if it would be wise to risk an all out over Crimea, though ... but I'd assume in the case nukes are on the table and it's "only" about Crimea, we, the West, might also ask the Ukrainians for a break and to reconsider before going all out. If intelligence determines nukes are of the table, I see Crimea becoming Ukrainian again as well. Actually not sure how I feel on that, since Crimea is the only region which would have voted Russian even without the manipulated referendum, so .... I'm split on that.