Although, I am primary a collector...I am also a gamer which makes the 2320 a great background for a Harder SF background to my Traveller universe.
Plus, there were many unresolved storylines hidden in 2300AD, and I have ever confidence that Colin is working hard to create more mysteries. Also, toying as I have with running yet another First Contact mission dealing with the encounter on Barnard's. 2320 will provide an excellent backdrop to the era before the Interstellar Wars began.
As if I understand Jon's project correctly, GT is going move full thrust into the IW Milieu bypassing the Contact stage. Which for me exploration is more interesting than war and 2320 will provide a background for events that I could create along the Rim eventually culuminating in the Pathfinder mission to Kysu.