Should our pupils be learning two languages?

Only a mere 45% of secondary schools in the UK offer two langauages at GCSE.
This means that a number of schools are lacking the resource of trained teachers. So how does this square with the government's plan to increase the number of language options for GCSE and for primary pupils to have the opportunity to learn at least one foreign language?
Will the teachers be up to standard? This could prove to be a problem according to the European Commission, as our pupils can not be taught by under qualified teachers in order to fulfil the plan. This would hinder the pupil and the integrity of the school.