Perhaps it would take too much energy to change itself. If it's not broken, why fix it?
Just in case you are serious (or someone else who reads this thinks you are), let's get this straight. Evolution does not work that way. A single lifeform does not change into something else during its lifetime. Change happens over (many) generations. If some trait gives one lifeform a higher chance of producing offspring than another, then these traits will be more represented in the next generation (children look like their parents).
What is needed is a good exorcism. IE6 needs to be cast out from the net and its bloated carcass nailed to a tree as a lesson to others.
The last time society cast someone out and nailed him to bits of tree, it started one of the world's most popular religions. Please, let's not make IE6 a martyr. We'll never be rid of it!
All seems condemned in the long run to approximate a state akin to Gaussian noise. -- James Martin