Indeed, that is the current position when we get a new version of US passports by some point in 2016.

Even today, requests for first time additional page inserts in brand new, undamaged passports issued this year are now being syatematically refused -- absent an "emergency" -- after issuance at least; and such passport bearers are being told to consider applying for a renewal passport.

If the passport was issued after October 2014, additional page inserts are going to be tough (and tougher to get). And when the page insert stock runs out, forget about it, as purchases of additional page inserts aren't what they used to be. That will make it tough also on those or with pre-October 2014 passports who may want additional pages in an otherwise unexpired passport.