1) Layman know fuck all about importance of open standard, they just care about ability to show the latest titty emoticon on their message.
2) We nerd know why proprietary standard suck ass, but all our friend, family, colleague use that titty_emoticon_IM.
We sigh and painfully migrate all our contact from old IRC/ICQ/MSN/whatever to that titty_emoticon_IM.
3) 5 years later, next gen kids think titty_emoticon_IM are for grannies, and penis_emoticon_IM rulz. Go back to step (1)
Thats why we can never have good thing.