Re: Scalability at Multiple Ends
I can't think of any area that runs on 2-year replacement cycles. For high end CAD, we are on 3 year cycles when times are good, 4 years when things are tight. For the average office user, we go 5 years at a minimum. Of course, budgets and time constraints are the two biggest factors. We don't have any real numbers to go on at this point, however, so we would have to see the price points to see if there is truly an ROI for cloud based VDI.
Since the tech came out, the cloud salespeople talk about all the money you can save, but with new deployment tools, the overhead of generating a new system from a company image takes less than 5 minutes of a tech's time. I think that many companies have determined that the price savings aren't really there yet, since hardware is relatively cheap nowadays. Companies love to save money, so if there was a huge cost savings, businesses large and small would be all over the cloud. Most companies I know use the cloud for non-essential purposes - backups, user files that are replicated to the cloud (another form of backup). or for high performance computing purposes (where it really IS cheaper).
One should also take into account the risk tolerance for losing your connection to the cloud - if you lose that connection, your entire company is now down and out, at the mercy of the telco. Not many companies are that confident in their connection.
Just some points to ponder.