I think as long as solo-play is possible, it'll bring a lot of negative impacts to having great memories. Valkurne Dunes was so epic because of group/party plays (oddly enough, frustration in the Valkurne Dunes was part of the great memory).

And Nidhogg was not an instanced battle!

Either way, best wishes to FFXIV ARR and hope we'll have a great time there just like FFXI!