YES! finally someone wants to talk about this!
well i remember the episode of pokemon where professor oak (or was it some other professor?) is showing ash a little clip about pokemon in his lab on that big screen and as he was doing this, he started talking about the wonder of pokemon and how there are over 500 kinds of pokemon.
now, if you think about it, every generation so far has had between 120-150 pokemon, and the amount we know so far is 386. if the Pokemon company is going by their word from that episode after, it must mean Diamond/Pearl may be the last generation of pokemon!! i know some of you may think that just because he said over 500, it doesn't mean that it'll stop there, but if that were the case, then why would they discretely choose the number 500 for that boundary? they could've said "Hundreds and Hundreds", but instead, they choose to tell us 500.
also, it would probably make sense if you considered the color/element factor of all the generation of pokemon games. it went from simple colors-- Red/Blue, to colors of stones (or just rocks for that matter) -- Ruby/Sapphire. but now, Pokemon is going to the most exuberant rocks of them all >>> Diamonds and Pearls. what could they possibly say for the next generation of pokemon? Pokemon Meteorites Geminid/Leonid? that COULD work for the absolutely final generation of pokemon so that it would refer to the "pokemon are from outer space" theme, but so could Diamond/Pearl.
is this the end of Pokemon? *dun dun dun*