I think like most games have hinted at the E4 / league before you actually get there, i bet there is a very low chance for them to get rid of it.
That said, we got Stevens Beldum last demo/opening giveaway, now Ash Greninja, do we have any more reason to believe him to be a potencial champion?
Hordes are probably gone, concidering the FPS in the double battle you get in the demo was drasticly lowered, I can only imagine it even worse in triples.
We got join avenye 2.0, so i bet there is some really easy access to evtraining this gen too, and concidering amie is upgraded, I don't see why super training wouldn't get a upgrade too.
Ha, I was actually more into Super Training. After losing two shiny Pokemon because of hordes, I kind of avoided them most of the time. It kind of sucks for the majority that they're likely gone, I suppose.