But that doesn't change my point on the matter what it does to appeal to older (and newer fans) and the message it is trying to get across to those same fans. I, and many others, have found the effort to be rather attractive and smart, and I don't see anything wrong with them using this theme.
And, even referring to the original English theme (or the fourth theme or even this one). While it does mention catching every pokemon more than one (which, AFAIK, they lampshade in the XY dub), the original theme also places great emphasis on strife and bonds. In fact, the strife is the central message, not the capture of every pokemon (that's why they have the line "To catch them is real test, to train them is my cause.") It's about the strife mostly, and catching all of the pokemon is a means to prove that, well, he's the best, and it's through the help of those closest to him (or to the singer) that help him to achieve that goal.