They’re a family and honestly, with the way that Valve has built up the friendship and brotherhood that the Mercs have, I doubt they will go seperate ways.
In my opinion, I am really certain they will stay together, and I think that would make the most sense with their characters, but we won’t know until we get there.
But God I hope these lovely men (and ?) stay together for as long as they live, and even if they don’t, they will always live on together in my heart.