Good Friday Agreement was signed 18 years ago now.
The question is no longer what did people want then, but what do they want now.
There has been 18 years of relative 'stability', albeit shaky & fragile & not without its problems.
People have had the longest period of peace for generations and for the younger generation this is all they've known.
18 years prior to GFA was 1980 - after a decade of violence and preceding a decade of more violence.
No one at that time could foresee any sort of peaceful compromise, yet it happened.
By the time Brexit has been negotiated it will be 20 years since the GFA was signed - time enough for the people of the island of Ireland to decide how they want to move forward into the future.
The divide & conquer strategies employed in the early 20th century and prior have long been denounced as unacceptable ways to govern (one household, one vote; open discrimination based on faith etc for eg), so there is no fear of a return to that regimen.
It is entirely up to the cross party and cross govt groups how things move forward and I would like to believe that they're doing their best to do so and ultimately it will have to be put to the people.
There seems to be a view in Scotland & Ireland that 'the English' want to rule over them at all costs.
This may have been true back in the days of empires, aristocratic rule & landowners but it's not now.
'The English' are no more a homogenous mass than anyone else is, and your average English person would not want to 'keep control' of any country against its people's will - just as they don't want to concede their own autonomy to others (hence the EU 'out' vote).