Crikey, is that you Christopher? Its certainly almost the same arguments Mc Gimpey used back at that talk in the late 90's.
Your argument is well thought out but flawed in the same way Chris's was back 20 odd years ago.
You can't predict the future. Surely if you have learnt anything from the last 10 years or so is that ANYTHING can happen.
To state the middle ground or for that matter Unionists cannot sway towards a UI is simply untrue. You cannot predict what factors might sway people. e.g. a massive economic downturn in Ni due to Brexit or Scottish independence to name 2 possible scenarios.
That northern Nationalists cannot maximise their votes in probably thee most important vote they will ever take part in is also wrong.
No, I can't predict the future.
But I was talking about the present. And the way things look to me, I don't see there even being a Referendum called, never mind a majority UI vote being achieved.
Meaning that for that to change, someone has to change the dynamic. Unionism does want or need to change it, so it is up to Nationalism.
Specifically, it needs to persuade a section of the Unionist population to cease being Unionists.
And I see nothing in Nationalist politics which is coming remotely close to achieving that. In fact if anything, it is going in the opposite direction, as SF gathers ever more of the Nationalist vote in NI, while making big gains in ROI.
Now you may have a benign view of SF and give them a hearing when they say they want to accommodate Unionists fairly in any future UI etc. But even moderate Unionists think "No way", when they see eg a former IRA bomber, Martina "Brits Out"" Anderson, being appointed as SF's "Outreach Officer"!

I mean, how would you take it if eg the DUP nominated Gregory Campbell to "reach out" to Nationalism?
(Rhetorical question, I think I know the answer

)
The debate for a United Ireland hasn't even started!
Rather than enter the debate you've chosen to do what Chris and Unionists have done for a generations. Rubbish and ridicule the idea and bury your head in the sand.
What have Unionists done to encourage Nationalists/Republicans to stay within the Union?
You've took the line that they don't need to bother. Nationalists are quite happy with the status quo... they have too much to lose in a UI scenario... I think that is all up for debate and we haven't even begun that yet.
Where have you been all this time?
The debate over a United Ireland (in the NI context, that is) started with Partition, when the NI state was originally intended to be temporary, and Nationalists looked longingly beyond that.
It continued during the 2nd World War, when the IRA cosied up to the Nazi's in the hope that that nice Mr. Hitler would sort out a UI for them.
It continued during the Border Campaign of 1956-62, when they thought they'd just bomb us into a UI.
And 1966 - that was another good one: the 50th Anniversary of the Rising was sure to be the date.
Then we had The Troubles, when Martin McGuinness assured us all that:
"At the end of the day, it will be the cutting edge of the IRA which will win Freedom"Finally we got to the GFA, or more accurately the St.Andrews Agreement, when SF assured their supporters that their negotiations had left a UI virtually within sight.
In other words, Nationalists have done fcuk-all but talk about/plan for a UI for the last 100 years, the problem being that they've been talking amongst themselves (alone

), with nothing conciliatory or persuasive to say to Unionism.