Anarchism exists, not as a set of organisations, but as a current of activity within society and within anti-capitalist social movements. The record of anarchism within UK movements is a good one -- mostly these have been protest movements, but that is down to the nature of UK society. Anarchism rises when popular activity rises (for example, during the poll tax protests) and falls again when activity diminishes.
So I'd say thatthe answer to the question 'does anarchism have a future?' depends how you see our society going. I'd say that mass movements and protests are going to continue to be a part of our history, and anarchism will continue to be a part of them.
Many self-described anarchists (as opposed to people who simply organise in anarchic ways) have gravitated to protest activism; partly because of the continued activity in the ecological and anti-military scenes, and partly because of the university backgrounds of many anarchist activists. I think the crucial test for anarchism in the next 10 years is whether it can adapt itself to go beyond the established protest scenes and link up with other forms of popular activity that are developing -- both in the community and in the workplace.