Totally agree Primarch
Like I said on the other thread, Look at this from the GW perspective for a second.
They are in the business of selling figures and the collective groan here suggests that they have pitched the scale just about right; small enough to allow both Titans and other figures (which 40k does not readily permit), large enough to prevent easy assimilation of old GW figures and more importantly 6mm figures from other manufacturers, and just possibly the 'right' size to entice the current GW fans to buy complete new armies with sufficient detail, poseability etc to benefit from newer casting techniques and materials. And it is a 'new' scale that others do not specifically support (though 'scale' is always a moot point).
Seems to the uninformed (me) to be quite a canny move for 'army' scale battles, even if it is not 'true scale', leaving the 25mm scale for 40K skirmishes. And if it comes off, it might just possibly morph into a full blown replacement for 40k as well as Epic. A big investment over time certainly, but one that could encourage a significant investment from fans, other than the few diehard Epic individuals scattered across the globe.
Now if only we could exert some influence over the rules (by helping design and / or Beta test), I suggest that it could just possibly become a really good game. However, I also accept that is rather less likely than winning the lottery, twice, on successive weeks, not least because of GW's past form

Sending a letter to GW gets my vote, because I don't think it would harm us.
If they develop a good ruleset with an appropriate meta, this would encourage players to develop the races and armies that they prefer, which in turn would fuel the demand for figures etc. that GW require. And working with a select number of individuals from communities across the GW spectrum could easily be managed providing they are properly directed and time-boxed.
Is this likely? Probably not.
Do we care? Again, probably not.
Would individuals help out if GW asked . . . .?