Let's say there's two timelines:
Original: 2063 (Zefram makes flight himself), then TOS, then TNG/DS9/VOY
New: 2063 (Zefram has help), ENT, TOS, then TNG/DS9/VOY
Would there be an NX-01 in the original without the crew of the Enterprise coming back in time and interfering with history? Even unintentionally pre-choosing the name 'Enterprise' for the first vessel? I know chronologically they couldn't have known of Enterprise in TMP or TNG, but there was no mention of it on the history walls. Could that be taken to mean the NX-01 or whatever it was originally meant to be wasn't 'Enterprise' or does the Next-Gen wall represent UFP ships called Enterprise?