Sure you can argue for another vote if you like, not convinced personally, but that will be upto politicians to decide. The only political party that agrees with you on this it seems are the LibDems, joined them yet?
Nope.
We are in a phoney war phase, where brexit still means all things to all men (and women) - but that won't last - over the next 18 months or so brexit will be nailed down as soft, or hard, or red, white and blue, or sky blue pink etc with the other options no longer available. That will drive divisions in the brexit camp.
So for example if it becomes clear that the direction of travel is for super-soft Norway style brexit, do you really think the hard core UKIPers will shrug their shoulders and mutter, 'sure, fine, whatever'. Nope, as we have already seen with at least one poster here, they will be fuming, claiming that the deal isn't what they voted for and that there is no mandate - quite possible they'll see a second referendum as necessary.
On the contrary, from the Dan Hannon wing (which includes many pro-ish EU tories) if brexit is careering down a hard non-single market route, with massive restrictions on migration (that those people think are essential for economic prosperity), don't you think they will be claiming 'this isn't what I voted for and it isn't in britain's interests - we have no mandate for this (easy to argue given that 48% wanted no brexit at all), we must have a mandate so a second referendum is essential.
It is tenable to me and many others, democracy gotta love it! Although I'm actually quite open to a vote on the deal, I'd be quite happy with Norway type deal personally.
And you have demonstrated my point ably - the settlement you'd be quite 'happy with' is completely unacceptable to another brexit poster here, with initials JK.
As to the Act I don't think it would have been possible to have made it binding since it was pre-legislative.
From Wiki
"pre-legislative or consultative, which enables the electorate to voice an opinion which then influences the Government in its policy decisions."
Nope it was perfectly possible, parliament chose not to. In the previous UK-wide referendum (on AV vs FPTP) parliament enacted a binding referendum - in this case they didn't.
I think any political party would have to change their policy given the electorate voted that way.
Why? By inference your line of argument means that when a government wins an election (on a manifesto) the opposition would have to change their policy to align with that of the new government, because they had lost the vote. That is non-sense - an opposition is quite within its rights to continue to consider that a policy is wrong even when it has lost a vote, and to continue to oppose that policy. Remember that MPs (and by inference their parties) aren't delegates (i.e. expected to align their position to reflect that of their electorate) - no they are representatives, voted in to represent all their constituents in parliament, but under no obligation to follow a popular opinion. And of course if constituents don't like the line their MP has taken, they can throw them our at the next election.