IMO the extension, if ever happens it should be within Gujarat itself, like Rajkot or Bhuj. There is no direct link between Western Gujarat or Kutch area to Chennai. But this train is in RSA with lots of other trains. So, the chance is remote.
Regarding VSG MAS Express, the reason given by railways was yard remodeling and some other engineering works in VSG. So it is now short terminated at UBL. Once that is over, it would get its full route. But there is no deadline for that.