Well, I think what most, if not all "simmers" would appreciate, is a well rounded product (sure, some would take anything on offer... that's a given) but most, a highly developed authentic model.
Developers, who are serious about their art, desire a product concept which can draw in their full attention.
The hard part is in the merging of the two.... the difficult part is in the having of real time information for the developers to work from.
Time and patience is a factor which must also be taken into account.
Me? I 'm happy for whatever the DCS developers decide they would work on, to create and bring to life in a virtual world, and have the patience to allow their focus to produce such... it doesn't matter if it is WWII, or modern, or pre - modern, or anything in between or before that.