Sorry for the delayed response. It's not a possibility, it is definitely happening. There will be SegWit + 1MB (Bitcoin Core), SegWit2X and Bitcoin Cash.
The activation of BIP141 requires a lock-in period (2016 blocks) of which 95% are SegWit blocks, and another 2016 blocks for activation, which doesn't require anything and is there as a "buffer" period so that businesses and pools can upgrade their software in time before it activates. Activation is projected to happen on 21st August and SegWit will be running on the Bitcoin mainnet then. Since SegWit has locked in already, we are past the point of no return.
Yes, the 2MB hard fork has been scheduled to occur on block 494784, estimated in November.