It isn't that hard to rebuild an engine, especially a 4 cylinder. I haven't seen an S2000 engine torn down so I don't know if they are using the thin piston rings that the high output motorcycle engines are using now. If they are using thicker piston rings then I would expect them to last a long time. Short stroke equals slow piston speed. How far the rings travel up and down the cylinders will determine how fast they wear out. 10000rpm with a 2" stroke would be 40000 inches of travel in a minute. 7000rpm with a 3" stroke would be 42000 inches of travel in a minute which would mean the 3" stroke engine would wear more at 7000rpm than the 2" stroke engine at 10000rpm. So it would depend on the thickness of the rings and the materials used, also lubrication.
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