With the reports saying that Team Rocket is planning to carry out their "biggest plot yet" in season two it seems that Team Plasma has been replaced by Team Rocket as main villainous group in the Unova region. Had those two episodes been aired, there might have been more episodes centered around Team Plasma, with N and Ghetsis eventually appearing. But with Season 2 about to begin, it seems that episodes 23 and 24 will be shelved permanently and Team Plasma will become a lost plotline. Unless they decide to air them on Pokemon Smash as "lost episodes", although I've never heard of any anime series airing episodes in Japan as "lost episodes" before.
Also how far ahead do the directors plan for the Pokemon series.
Seeing that Neo Plasma do look like Rocket Grunts does support this theory. Thought hopefully next gen they leave the new Crime Syndicates to the Movies and give the Rockets the whole Anime antagonist role, that way they don't have to deal with needless backstory of characters that were not important to the anime what so ever.