I mean if ghum moves on with Sai Satya pair, then virats character has to "die" before the leap. Cause if after leap it would be very weird that Sai Satya are still happily married and virat is single.
So if virat needs to stay, they need to bring sairat reunion and separate them again before the leap and then the kids will bring them together after leap.
So ya there is a chance with Neil leaving escpecially since Aishwarya left the show. They could sign up for reality shows like nach Baliye etc. Neil won't leave for some time as the Bhavani and amba drama just started. So he is definitely has to be there at least till the leap.(if there is leap).