"Finally, I feel that there's no need to try to lure more Windows users to migrate to Linux. Linux has already passed the threshold of immortality and it will stay alive and well whether it attracts more user from Windows or not."

It would be a great cost savings to the world, in terms of direct money saved as well as indirect incompatibilities, if a significant part of the software using world used Linux and other open products. In other words, it's not just to improve the lot of Linux, it's also to improve (change) the world.