That's probably one reason but as history proves people will stick with what is popular and has a big install base unless an alternative exists that is so compe

That's probably one reason but as history proves people will stick with what is popular and has a big install base unless an alternative exists that is so compelling that there is a real incentive to adopt it and help push it as the replacement. Silverlight apparently is not catching on in that way. Even companies Microsoft paid to use it are jumping off the ship. That cannot possibly be a good sign for its future.