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My guess is that they may have a new way to do this in the pipeline that doesn't need a plugin, but we will see.
Since Yahoo took over Indextools last year, they have gone quite quiet. Infact - if you don't know an existing Yahoo Analytics partner, you probably haven't tried to use Yahoo Analytics... which is a pity, because is does have some really good advantages over Google Analytics. I aksed our account manager what their plans were and needless to say... they were not specific, but...
They are still working on the thorniest challenge, which will be to transfer all the datacenters from Hungary to the Yahoo datacenters. This - it seems - is a massive challenge and until they have done this, they are keeping quite a low profile. However, when they do make the move, I expect it will be easier to get Yahoo Analytics. The question, of course, is whether Google Analytics overtakes their functionality in the interim.