With the recent "retirement" of "The Adventure Begins",DAK has joined Epcot and Hollywood Studios by only having an audio "announcement" at Park Opening.(By the way,I think the best Opening Announcement of the 3 is Epcot's,where Guests hear "Good Morning" in all of the Wordl Showcase languages.)
Disney Parks Blog has an entry today about "Magic Kingdom Welcome",so hopefully that is a good indication there are no current plans to "retire" it also.
One thing that SHOULD have been noted in the entry is that Disney uses shorter versions of "Magic Kingdom Welcome" at times.
http://disneyparks.disney.go.com/blog/2011/12/a-great-way-to-start-the-day-at-magic-kingdom-park/

Disney Parks Blog has an entry today about "Magic Kingdom Welcome",so hopefully that is a good indication there are no current plans to "retire" it also.

One thing that SHOULD have been noted in the entry is that Disney uses shorter versions of "Magic Kingdom Welcome" at times.

http://disneyparks.disney.go.com/blog/2011/12/a-great-way-to-start-the-day-at-magic-kingdom-park/
Oh no, please, don't even think about it. That would be tragic. The MK Welcome / Good Morning show is soooo special! 

I sing along, we know all the words. I still get excited when the characters come in on the train, I'm like, 'look, its Mickey! and Pluto!!" LOL