Heres a prime example of why most dont or wont change: My Mom is on the older side, retired, with slightly limited mobility and spends a lot of time surfing the web. Shes pretty good at it and enjoys it immensely. I tried to get her to switch to Firefox from IE. She had never heard of Firefox, Had no idea other browsers even existed and couldnt figure out how to use it right away. She said she would try to get used to it but when I went back it hadnt been used since I had been there last. The people who use IE dont like change, have a hard time adapting to change or dont even realize there are options. Its the default so its what they use.
I can understand that point of view, and to some people it may not be important. Let me re-phrase what i said before.
If you have any technological knowledge, and rely on internet efficiency, it is beneficial to have the optimal browser. It may not be the most important choice you make in day to day life, but it can make a difference in you're every day operations depending on your computer usage.
I'll pull an example out of my experience. I have a friend who preached google chrome. This friend works in IT, builds his own computers piece by piece. He built my computer (which has surpassed my expectations). At one point I attempted to use IE on his machine. The computer proceeded to freeze. My friend laughed at me and said never to use the browser again.
I'm not sure why it affected his machine the way it did, and i recognize that others use this browser without the same issue; However, I have come to accept that this browser does have flaws. Weather that flaw is the fact that the majority use it and therefore it is more likely to be targeted or that it is more susceptible to infection, is irrelevant. The fact that people are better off with another browser is not.
It is plain and simple that you are better off with an alternative to IE. I agree that it's probably circumstantial due to the majority usage of this browser, but that does not make the point invalid.