The decision making sense in the short term is the only thing that matters. Sports games are released every year, that's as short term as it gets. Konami focuses on making the last current gen PES the best they can then they have a year to devote their attention to the new consoles.
There will be way more people with 360's and PS3's anyway, not everyone can afford to or even wants to buy a next gen console at launch. Why try and sell a half *** next gen port when the smart thing to do is just wait until there is a larger number of consumers who own the systems *cough Madden 06*? This won't hurt Konami at all, if anything it puts them in a position to dive into the next gen systems with a more defined focus.