I recently tried to get back into the hobby. There are three basic reasons why there is GW fatigue.
1) World recession. Middle class parents are more price conscious and us poor people can't actually afford them.
2) Outrageous price gouging for boxed sets - the only time I buy retail is to keep my local FLGS (friendly local gaming store) open.
3) Terrible power creep in the rules, constantly expanded to only benefit people who buy multiple £40 sets, resulting in existing forces being worthless in the current metagame.
( 4) Awful fluff rape, turgid world expansion, consistent retcons and Matt Ward/CS Goto ) This last point is purely subjective and largely limited to neckbeards' like me - the rest have more or less universal community support.
None of this is news, it's been a constant topic of discussion in gaming circles for months. We're seeing a resurgence of tabletop gaming at the moment, but when you can buy a complete game system for £60, it rather makes £25 for 5 Terminators without the option of lightening claws for all of them seem like a vicious corporate fisting without lube.
But this is not an issue. Like everyone else in industry, the people at the top will move on when it suits them and the hobby can die in a fire.
Now if this was just my opinion, then fair enough. When a friend of mine who used to be a Games Workshop Mail Order Troll (and ex-Golden Demon finalist) is offering to sell me his Space Wolf army because he thinks the game is completely broken, then I have to lean towards the idea that the cash-cow has been fully milked and it might be time to start investing in your consumer base again.
But hey, what do I know. Apart from making a multiplayer game with millions of players and being a Commercial Analyst in the games industry. I'm probably just being cynical.