Interesting that even on this poll which is asking will it happen we have come out at 52:48. Peoples views are firmly entrenched.
You are illistrating perfectly why referendums are wrong. Entrenched means fixed. A 52:48 split means that the opinion is divided. The fact that the split is much the same as the referendum result (50:50) means views are firmly entrenched only if NSC is a fair representation of the naion as a whole (and people say NSC is raddled with lefty snowflakes so presumably not) AND all the same people who supported remain or leave back then are the same people who think we will remain or leave now. To deduce this means entrenchment is speculative. I think it is unlikely since it means that 100% of us are guilty of wishful thinking (wanting and expecting the same outcome). This is extremely unlikely given the numbers of people howling about having their Brexit stolen away, or (equally absurdly) being forced into a no deal even though they want to remain. So overall I couldn't imagine a deduction more wrong than yours. Not much change there, then.