Let's face it: They already dropped the "3d" from the official name, most people here (including me) didn't even notice this change and still refer to "3dgs".
This won't change with another name change.

Using "T7" for advertising might work out, but in first place I agree with the lack of quality demos. It's not especially that there are none, but I think they are not placed very good. For the potential customer demos linked in Wiki and forum can be considered as very well hidden.
Take a look at how other companies do that: http://www.quest3d.com/index.php?id=15

Without wanting to advertise this engine or start a discussion about its features (so don't even think about starting another engine war here), I think this page works out very well.