Professor Graham Donaldson, who was tasked with reviewing the curriculum in Wales, has set out a reform programme which does recommend that teaching of Welsh should remain compulsory until the age of 16.
However, Welsh language campaigners are calling on education minister Huw Lewis to go further when he formally responds to the report.
Former NUT Cymru secretary Gethin Lewis and Bangor University linguist Professor David Crystal are among a host of signatories who want assurances that the Welsh government will fulfil its pledge to see all pupils in Wales speaking confidently in Welsh regardless of what schools they attend.
They say it is clear the current system of teaching Welsh as a second language is a failure.
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