okay, something just occurred to me.
the flash forward in Ep. 7 to 214 years first mentions the "Golden 7", we see VVV IV with gold armor and saki wearing a pilot suit with a gold motif. and fighting another soldier.
the flash forward in Ep. 12 to 211 years we see saki and that kid talking about the history of their country.
in Ep. 15 we see saki, the kid and satomi talking about marie. the same goes for Ep. 22 when they went to the old sakimori academy building.
in Ep. 24 we see saki, the kid and akira who finished telling the story to the kid in the old sakimori academy building and since in Ep. 22 we clearly see the year is 211 we can assume that the year of the scene is still 211. after that scene we see shoko in the memorial core wearing the RED pilot suit for VVV I.
Conclusion: the fact that in the end of Ep. 24 the "Golden 7" was not mentioned was because the Golden 7 didn't exist at the year 211
whereas in the year 214 the Golden 7 exists. i guess a different story unfolds between year 211 and 214 probably another war because the promise saki made with haruto was that both of them will not give up until the bitter end(which is protecting everyone). so maybe the students are being hunted down by a different faction since the dorssian royalists are probably allied with M77 and the emblems of the dorssian royalist is different from the emblem on the mech in Ep. 7, maybe a military group who wants to eradicate the magius including the M77 students.
so if sunrise wants to make a S3 or just maybe a side series they probably can.