Thunder Bolt
Silly old bat
It would mean that all future referendums could be considered impermanent or ineffective, or pointless. This could extend to general elections. It was made perfectly clear to the electorate that the results of the Brexit referendum were final and to be implemented. Going back on that democratic promise would undermine democracy.
Besides, people are not fully informed what Brexit means, even now. In fact we know little more than we did in 2016. We do know that this government has made a disastrous effort in carrying out the Brexit negotiations, but nobody knows what Brexit is going to look like, or what kind of deal we will we get, if any.
If there is ever a referendum in the future, it won't be worded in a binary fashion with such open ended possibilities. It doesn't make any difference what was said or put on leaflets, the actual act of Parliament said it was advisory only.