IE6:IE7 :: MS Office:GDocs is not the best analogy. Lots of people stick with IE6 rather than go to IE7(or FF or Chrome or..) because, for what they do, IE6 is 'ok'. I'll hazard a guess that lots of average web users don't even care about tabs leave alone CSS implementation details. And so, IE6 is 'ok'.
One could argue that MS Office 'sucks' just by costing more than GDocs which is free. If Google wasn't so opaque about what their plan for GDocs is... maybe they should go at it more whole-heartedly and promote it and then see what happens.
Heh-- Office does cost, tho I think MS does a stellar job of hiding it. Of course, they are trading one "suck" for another. Web based Office efforts are pretty freakin' painful, IMO.
One could argue that MS Office 'sucks' just by costing more than GDocs which is free. If Google wasn't so opaque about what their plan for GDocs is... maybe they should go at it more whole-heartedly and promote it and then see what happens.