Seeing as the Cloud had departed from the Ohel Mo'ed (See Pasuk 10), why did the people not travel?
Seforno: Because they realized that the Cloud only departed in order to distance Miriam. 1
Da'as Zekenim: They did not travel because the Cloud did not go, due to Moshe's honor. 2
Hadar Zekenim: They did not travel, for the Cloud did not go to honor Moshe (avenge what she said about him), since the Cloud was in her honor. 3
I.e. verse 10 discusses the Cloud above Machaneh Yisrael, and not the Cloud that showed them where to travel. Alternatively, it departed and returned, or went only up, and did not lead them in any direction. (PF)
On what merit did the entire camp of Yisrael wait seven days for Miriam to be cured before moving?
Targum Yonasan (14): In the merit of Moshe (whose honor had been wounded).