The old guard are thankfully dying out.
I agree with this, but I also worry that all of this is currently happening at a really dangerous time. As their numbers get smaller, they seem to become more entrenched, and at this point, while the numbers are reduced, there may still just be enough of them to do real damage in a final flurry of resistance. (I am talking about both sides)
I also think that there is a level of deprivation/lack of aspiration that contributes to the violence. Fighting for something, even if you don't fully understand it, is something to belong to, a focus, something to do. So while young people now are more removed from the troubles, they continue the same mentalities because it is a way of being part of something bigger than themselves. Similar to gang culture I would imagine.
I read somewhere a while ago (so forgive me if I can't find a link to back this up) that more and more people now consider themselves Northern Irish, rather than British or Irish. Young people are now in the no mans land that the GFA created. They can be British, or Irish, or both. But maybe now they feel like neither. I speak from experience here. This is how I feel, and I was around 10 when the GFA was signed. I know that my peers feel similar and some of my younger cousins as well.