The 2000 round figure was probably an across-the-board figure, taking into account typical usage that might not be as easy on the gun as what an enthusiast might subject his gun to. We all probably take better care of our guns - keep them cleaner, use cleaner ammunition, handle them more carefully, etc., which is bound to help.
I don't think S&W ever said the gun would be destroyed, fall apart, or anything even close to that. Their thought "probably" was that at about the 2000 round mark, the gun might need some attention. Seemed pretty reasonable to me. Again, this is all just recollection.
Talking of Commanders, I do HAVE a Commander that failed (cracked frame) and can say positively it didn't have 2000 rounds through it. I purchased the gun new in June/July, 1969. It cracked some time in the 90s - around the dustcover area - not through the slide stop hole. The gun was always a lousy shooter (it is a 38 Super) and Bar-Sto had installed a barrel and bushing to help solve the problem. (Which it did.) The gun was returned to Cxxx, who declared that because it had a non-factory barrel, non-factory sights, non-factory magazine, AND because it was SO OLD, they just couldn't help me.
The gun is still serviceable and the crack seems to have de-stressed itself sufficiently that it so far has not gotten much bigger, if any.