There was a lot of skepticism after Disney bought Lucasfilm and announced that we would be getting new yearly Star Wars installments, starting with Episode VII of a brand new Star Wars trilogy.
30 years of anticipation for the continuation of George Lucas’ epic original Star Wars trilogy is hard to live up to.
In lieu of just Obi-Wan appearing, an intervention of the magnitude that Yoda presents would make a lot more sense for a Force Ghost Jedi Council of sorts.
The other problem is the fact that the only Force Ghost present is Yoda.