Yeah, agreed. As it is, we're nearly three badges away from the league, and if Ash beats the Fairy-type Gym Leader in XY074, that only leaves two more badges for him to get. So unless the writers pull a DP and really draw out the saga to unnecessary lengths just to ensure they are finished before the next generation of games, they're definitely going to need a post-league sequence to buy time for the next generation, assuming of course the Anime even is going for the next generation anyhow, since by our estimates, at the latest, Ash will do the Kalos League in January, and may even get to the league by December of this year. And so far, there isn't even a hint at there being a third version of Generation 6 or even a sequel-set of games. If GameFreak is planning on a third version or even sequel games for Generation VI, they would have announced they were going to E3 as a hint at this. Seriously, even Pokémon Emerald had already been announced by this time in AG.
Like it or not, Famon, the writers are going to need to do SOMETHING to tide people over for the next generation since they're obviously moving at a very quick rate through Kalos. An anime-exclusive league akin to the Orange Islands, the Battle Frontier, any new segment of the games Ash might partake in, heck, even actually winning the league and then pursuing the Elite 4 and Champion of Kalos would have at least ensured that they bought enough time for the new generation of games. If they end up continuing the rate they're going at, there's zero chance of us getting Volcanion, not in the Kalos region, at least.