In your opinion
Because we are two different countries with two different cultures
I'm not so sure it hasn't. The airing of animes on official streaming websites is on the rise. Also, sales of manga are pretty high, and that's with rampant piracy. FUNimation is airing One Piece episodes an hour after they air in japan.
I don't know what you mean by "implement" so I'm going to guess you mean successful. I think it has been successful over here though. In Japan, anime isn't what all the "cool kids" are into and it has a similar status here as well. I've never seen concrete sales numbers for the West so I can't comment on whether or not titles sell better over here, but from what I've heard about Japan, a series selling 21,000+ units in it's entirety is seen as a success, which doesn't seem like a number that the West couldn't pull.
We'll take over eventually i'm certain of that. It's slowly but surely taking hold over here where as I grew up with just DBZ and Tenchi, my little sister has Fruits Basket and Kimi no Todoke, my brother has Naruto, One Piece and Bleach. As more is released over here more people will take it up.
There will be a huge explosion in a few years when us 16-21 year olds have kids, I plan to have my kids grow up with Ghibli and hopefully more Hosoda films as I expect everyone here will. Eventually the majority gets educated to it all.
My biggest concern is that as our market grows and the japanese shrinks more and more anime will be either marketed directly at us which will make it lose it's charm and creators might want to play it safe with ecchi and shounen and we'll see the good stuff dry up. just look at the previous few seasons although is Code Geass R3 is this season i'll be happy.