[Dixielandjazz] where does Dixieland end?

[Bill Haesler]

 Gary Lawrence Murphy, in his latest interesting and thought provoking contribution, wrote [in part]:
> I've been hunting back through my Fletcher Henderson recordings looking for a tipping point; as early as 1923 with Coleman Hawkins it doesn't really
> stand up as a 'dixieland jazz' genre, he's got a far more orchestrated, structured thing, but perhaps too structured to really be called jazz?

and cited  - Shake Your Feet - New York, November 27, 1923 - YouTube
   http://www.youtube.com/watch?v=DvvbeJCmqZU

Dear Gary,
For me, it was when Louis Armstrong (and Buster Bailey) joined Henderson at the beginning of October 1924.
Try, the now "old warhorse', "Everybody Loves My Baby", made three weeks after he joined the band.
   http://www.youtube.com/watch?v=BqRERsE_1gs
From what I've read, it certainly shook up New York at the time.
Very kind regards,
Bill.