For this to succeed, each pupil over the age of 7 in a school would need half an hour a day of a language, taught by a language specialist, and for this to continue in high school, rather than starting from scratch. Peripatetic language teachers might be part of the answer. Otherwise, it just won't work, as others have said.
However, languages have been massively undertaught and devalued for at least thirty years so I don't think there are enough language graduates who also have a teaching qualification and want to go into teaching. So unless the government trains more teachers (at a time when they are setting private against public sector workers and interfering with teachers' pay and conditions) this won't work.
What is possible is for languages to be restored to their position as part of the core curriculum at secondary school level and for teachers to go on inservice training courses to boost their language skills and language teaching skills, if necessary. Mandarin and Urdu should be up there with French, German and Spanish, and local community expertise should be drawn on.
Gove's idea should be something to aim for, once we have a good, solid cohort of language graduates again. Except of course that it is now very much more difficult than it was to get into university.
It's a lovely idea but it's not fair to dangle this in front of us when the government have not said how they intend to make it possible for it to happen.
Someone stop Gove from simply repeating the mistakes of the past.