Then it is not a long term strategy
Who can say that linux won't be the primary application development platform for hand-held devices like google's nexus one or nokia's linux based devices? Or the primary web design platform for WebGL? Then many of the today's linux desktop users will become app or webgl developers for those platforms (which includes opengl based graphics design). What would they think before building their next machine?
"Hmm yeah AMD's linux support is crap but I hope it will get better in the future"?
Its not logical for a long term strategy to be this* blind...