Tell me, when has seam and swing worked in India or Sri Lanka? Not very often, because very rarely do you get Test pitches produced there that help seam, and swing is hard to achieve with abrasive outfields and dry air.
How many medium-fast \ fast-medium \ fast bowlers do Australia have who offer something more than seam and swing. Bichel, Kasprowicz, Lee, Williams, Bracken, Tait, almost anyone you care to name: no way.
The notion that you can hit a quality batsman with "pace" has been proven ludicrous many times now, but still people cling to past misunderstandings.
The best chance of beating India in India and Sri Lanka in Sri Lanka (as South Africa and England respectively have shown) is to possess bowlers like Donald, Klusener, Gough and White, who offer movement in every way you could imagine, on any surface. Because outstanding bowlers prevail on all surfaces.
The wickets in Sri Lanka and India tend to suit spinners. Yes, the batsmen are hence better equipped at coping than most, but still, outstanding bowlers will prevail. Warne has simply gone to pieces on his two tours to India (not, significantly, on his one to Sri Lanka) and I can't conceive that this will possibly happen again. The failure of MacGill can't have much stall set by it - he's an ordinary bowler and India are the latest in a line of increasing length of decent teams to prove that.
If Australia go to India and Sri Lanka with the attack of McGrath, Gillespie, Inness and Warne, they will have a better chance than if they don't take either of the latter two. If Lee goes there he's almost certainly going to get a pasting even worse than what he's been handed-out to for most of the last 3 years. Bichel, Kasprowicz and others who have good domestic records (note: this excludes Bracken and Williams) are essentially proven Test failures. No reason to expect that to change in Sri Lanka or India.
If Brad Hogg goes to either place I would be hiding my eyes if I didn't want to see him hammered and exposed as rubbish once and for all (though Lara did a reasonable job).
In summary, I will be disappointed if Sri Lanka and India fail to beat Australia, but of course in this game you can never say anything for certain.