I'm getting a little confused about this claim : it's obviously not only a matter of look, as discussions have spread upon army lists, and that the question of the poll attached to the petition is related to the Necrons' fluff.
- The army list point seems to have been solved by @darkreever
who posted official formations allowing to play Necrons as they were in 3rd Edition.
- The fluff concern is probably something where nothing can be done. W40K background is always evolving and, yes, they have developed a basic "killer robots" background into something far more detailed (which does not prevent players to use them as killer robots, though). It's the same as for the World Eaters, who were first just presented as "mindless killers", and for the Horus Heresy in general (and at larger scale, with 30 novels and a lot of short stories and audio drama expanding and detailing the basic fluff).
- Now, the miniatures : who really thinks that a 100 signatures petitions could make GW change models they have probably spent months (years ?) to set up ? It's nowadays possible for people to bypass official miniatures they don't like, whether by customizing them (not mounting the "bling-bling" parts and using green stuff to replace them of fill the gaps) or by buying other "count as" miniatures of the same scale (not necessarily from FW or GW ... http://www.warlordgames.com/terminator-genisys/
, for instance).
Another solution could be to launch a crowdfunding project (kickstarter, ulul, ...) for creating "killer robots" miniatures that would match the needs and desires of people not happy with the current Necrons serie.