I can see requiring that English be used in all official proceedings, for example, in court cases. But if English is made the official language to the exclusion of all other languages, will "E Pluribus Unum" still appear on our money? Will "Semper Fi" remain the official motto of the Marine Corps?
Will Congress be fussy about which dialect or dialects of English get approval? For example, can a bloke still drive his red-coloured lorry? Can he take the lift up to the first floor? Will shagging and buggery still be permitted between consenting adults?