Wow. Sorry, wrong. The money in virtualization is in the data center, not on the desktop, we are talking several orders of magnitude difference.
Yes there are many use cases for desktop virtualization and you point them out, but they are all niche markets which specific products have been optimized to target.
The reason desktop virtualization lags behind and has not caught on is not because it is particularly painful to use, it is because the use cases don't generate as much money and therefore vendors are not putting as much effort into it. Server revenue is far more important.
These ad-hoc statistics we see quoted are absolutely useless. 70-80% of people on LWN is not a great market compared to 1% of corporate data centers.