Yes, since you are deleting the replication session for resizing the file system - you would need to start the replication all over again when you restart it. I am not aware of any roadmap information in this regard, you should contact your EMC rep for roadmap/futures information.
Is there anyway to resize a replicated CIFS share without having to perform a full re-sync?  Thanks.
VNXe - Resize a replicated volume?