Would I say 'no' to DTM 95? Unlikely, but at the same time it would make less sense to me than adding the 2012 or 1991 season.
The problem that I have is with the content being locked so mods aren't possible. I understand the reasons why, but it does mean that I would desire additional seasons with existing models (assuming the guys doing skins and 3D are different). So DTM 1995 would be all new physics, sounds and 3D models creating, whereas we could get the 91 or 12 seasons with much less development requirement.
Oh, also, to me, 1993 was the death of proper cars in DTM! That's another reason.
I've really liked the gradual progression that the S3 team have taken to planning content. Since DTM13, we've seen them add GTM that is able to use a lot of the same resources so we are able to enjoy the new content faster than if something were designed completely from scratch.
I'm sure they already have their own roadmap as to what will be added to R3E in the future, but from where I am I hope that it is a focused game on GT and touring cars. My issue with Project CARS is that I can get many cars but few 'full' grids with competitors. A C9 Mercedes is nice, but without 962s, R89Cs and XJR9s to race against, I won't get the experience that I'm looking for in my gaming (personal view, I know!).
Having seen that the list of tracks in progress includes Spa, Silverstone and Paul Ricard, I'm personally hoping we see a Blancpain Endurance / Blancpain Sprint addition next year. A lot of the resources (car models, tracks) would already exist and 'only' license, rules and skins (and maybe a Bentley or Aston GT3!) would need adding in order to achieve this.
From there, I'd love to see some older seasons of GTM/BES/DTM/WTCC being filled out with models that exist in the 2013 pack. 2011/2012 WTCC would give extra life to the great models in the 13 pack and allow me to fake a career path through a few seasons (I'm a pen and paper championship wizard!).
This approach of using existing models and adding maybe one or two as needed to make a 'season' would be my choice and probably more realistic than saying "I want 1998 BTCC, 2001 DTM, 1983 ETCC, 2007 TC2000 and 2012 V8SC", which would each require their own set of new models, physics, sounds and tracks.
Quality over quantity (but quantity of that quality) would be my hope.
Either way, I look forward to seeing whatever may come.