at this point, yes. There are still tons of phones available for launch day delivery. Apple may have screwed this one up. So glad I woke up at 3am. #sigh
Yes there will be phones available for walk-ins. Simply just go to the apple store and line up. When you are next, you can reserve based on their stock availability.
I was able to get my iphone x as a walk in. I went to my local VZW store, skipped the line at the apple store and walked out with a new phone in probably 20 minutes (maybe even 10).