Nobody likes it when people have miscarriages, but worse as this may seem, it is good for Anjali because it has become all the more easy for her (or rather Arnav) to sever her ties with Shyam. As without the child she will have no relationship with Shyam.
Two most important things that might emerge from this are:
1. Khushi knows Shyam too well and she will unearth that Shyam is the culprit and so he will be brought to justice.
2. Anjali will probably get a nice man who will love her.
And I can't wait for either of this to happen.
I am ok for Arshi marriage to take a back-seat just to see this happening. Because if Shyam is on the loose he will always plot Arshi marriage from not happening.