I only play in a small group and although we've played many games we've kept our GW stuff and still purchase from time to time.
My latest warhammer army is composed entirely of non-GW minis, with the exception of a single helblaster I bought as my first model during 4th edition. However I have recently bought a new black dragon and plan to get the garden of morr kit, so I'm still buying from GW, even if it is less than I used to.
I think much of the spending made by vets and gaming groups is cyclical. It certainly isn't the case that all groups are seeing a drop off in their base of GW games.