I agree with the posters and disagree with the article - you've got it backwards. No-one is going "a", they either own"b" and are not going to run the enormous investment into "a", or are going to move to "g" which offers "b" comptatibity - ( I may be wrong but I didn't see the article comment on that ). I also don't see an IT Dept wanting to explain to users why they must use THIS card in THIS area but not in that, and why THIS card doesn't work in THIS MACHINE or at THAT clients facilities.
One poster mentioned the ADVANTAGE of "a" is the limited range so as to prevent overlap. I really don't see going into every office in my company testing out range/interference and putting separate 802 a/b/g systems to limit/increase range. I'll simply limit the transmitter.
802.a protecol was stillborn before it got going