Is the end nigh for Radio 4?

An interesting opinion piece in the Telegraph today which Gillian Reynolds seems to suggest that the end of Radio 4 is nigh.

Looking back at the weekend's 40th celebrations of Radio's 1-4 she says

Former Radio 4 controllers Monica Sims and Michael Green spoke of past battles to keep it as we know it today. Green said how, in the fight to stop the LW frequency being hived off to become a separate news service, listener power had defeated both BBC managers and governors.
Is it safe now? Current controller Mark Damazer thinks it is. I wouldn't be so sure. A decade hence, when digital switch-over is complete and the BBC's Charter expires, the licence fee will probably go, leaving Radio 4's future to subscription and market forces. Enjoy it while you can.

http://www.telegraph.co.uk/arts/main.jhtml?xml=/arts/2007/10/02/bvgillian102.xml