I still think its worth marching because it builds momentum and cements a proper pro-European movement, which has grown to be bigger, more organised and more motivated than ever before in the UK since brexit.

There are now energised pro EU people who are almost entirely single issue European federalists, if you go on the main Facebook (private) groups there are 70k - 100k people whose main political focus is being pro EU, they really really care. There are a lot of them, that never existed before brexit.

So I think in that sense its key to keep this movement going and energised with purpose, it will be a starting point post brexit and they will get even more energised if brexit continues to get more obviously dumb and carries on failing and delivering nothing.