Warhammer is Warhammer, TES is TES. The point was just to get across the idea of a darker space fantasy within the Elder Scrolls universe.
Why in the Elder Scrolls universe? You would really have to mangle it to get that 40k feel. Dark Grim and Gothic don't spring to mind when I think of TES.
Anyways, I got much more positive responses on other forums. I suppose I'm not all that unsurprised that a Beth forum would be resistant to changing up the formula given the amount of qq for even the clearly positive improvements in the TES franchise.
The point is that It is not a good idea. I love 40k (or the fluff behind it). I love TES. I don't think any cross over that would make this work.
Now an open world 40k game could be great if done well. But one involving TES? Meh. TES In space? Meh.
What I am trying to say is that merging two great things doesn't make a even better thing. It ends up a mess. Moving something from one timezone to another doesn't make it great. It makes a mess with a poor backstory. Far better to think up something new or just stick to one concept.