Ash's eye style isn't drug induced. It's a shallow and unfunny joke. Sorry.
They cared in the first seasons because they never expected the series to continue. They wanted to end it off with a Mewtwo finale, but the franchise got uber popular, so they continued it. Why it has become more of a marketing gimimick now is anyone's guess, but Julia pretty much summed it up.
Which begs the question of how anyone can call DP an improvement. Especially with that horse crap Takuto fight they call "surprising and fantastic" because Pikachu took out Latios. You'd think it would be obvious by now that being a mascot and uber popular, Pikachu would get the best screen time regardless of who he's fighting. It's like when Megaman fans say "MM9 made you realize you don't need charge shot or slide to win this game" when in all honesty, you have to design the game and enemies with the character's abilities in mind or else you're a bad designer.
Oh i'm just rambling now....