I think right now Farah needs stability. Her last 2 movies were both huge openers but did not sustained and were trolled.
so instead of going too big, she should make a more controlled movie that has just a few simple targets on it's mind. it also needs to be good of course.
with SRK, both those are unattainable. the movie will be bad, that is a guarantee, and also SRK will as usual make it too big and will hurt the movie instead of helping.
plus given that Rohit is producing her next movie, I don't it will have SRK. a younger gen actor maybe. I think it will be Ranbir or Varun. lets see.