Has quran got anything more to offer which Gita is already not offering. A german indologist once said Gita's preface has more spiritual and worldly knowledge than whole of Bible and Quran combined.
And if India has to remain undivided then Muslims have to be brought back into the Dharmic fold. Moreover Hinduism doesn't bar us from inquiring and if we like then embracing other religions which not a case with Islam, so this is a very wonderful move to help introduce Muslims kids to the religion of their forefathers.
And i have no problems if Quran is taught along with Gita to children across India.
You should also note none of Hindu epics can be compared to Bible and Quran.
Muslims and christian epics are like an advertisement for their faith which can not be said about Hindu epics.