I'm not super worried about it. GW ebbs and flows. 4 year "dark periods" followed by 5 year "bright spots." It's just how it works. We're currently 1.5 year into a "dark period."
There are lots of other super cool alternatives that people can try out if they're frustrated. WHFB is a great game that few people want to show love. WM/H is very solid, and the stock issues have been getting SLIGHTLY better. X-Wing is awesome and people should absolutely take the 30 min to learn how to play. The Star Trek game is literally an X-Wing clone. Malifaux, MERCS, Infinity, Dark Age, Bushido, Hell Dorado, Mage Knight (it's recently been relaunched) etc. etc. etc.
Then there's always Magic, which does nothing but grow and get better...
Point is, there's a lot of solid alternative.