To answer these points, I've included below paragraphs from the Call:
1. "By revolutionary, we mean sudden thorough change, preferably through peaceful means like a general strike. Gradual reformist (e.g. Keynesian) change won’t lead to socialism because gains that can be won during a boom are taken back in a slump or recession."
6. Socialism must be democratic – we reject the idea that the regimes in the USSR, Eastern Europe and China were socialist, but we believe in unity between revolutionaries who called such regimes “deformed workers’ states”, “state capitalist”, “bureaucratic collectivist” or simply “Stalinist”.
7. Socialism has to be international, particularly in this globalised world. We reject the idea that there is a national solution to the problems of capitalism.
8. A second credit crunch, which this time would mean that capitalist governments would be literally unable to bail out the banks even if they wanted to, could happen at any time, and we need to be more prepared than at the time of the first credit crunch and use such an opportunity to seize power via an international socialist revolution.
I agree with the use of elections (as I've said above), but a heavily flawed electoral system that discriminates against small parties is deeply flawed - I'm a long time advocate of proportional representation but am not imposing that on my Platform before it even gets started! Also, one vote every 5 years is not exactly democratic. What if an economic crisis, such as a second credit crunch mentioned in point 8, happens at a time when elections are long off? I argue strongly for elections soon after the masses take power, to legitimise the revolution.
Point 1 above answers Deborah Rushton's argument that "REAL change is not only possible, but also desired by the public" - staying under the confines of capitalism makes REAL change impossible, hence Miliband and Balls embracing austerity. I would hope this could be overturned at Labour's September conference, but even if a vote is won against it, the leadership would simply ignore it judging by past experience.
The combination of a globalised world and a second credit crunch causing economic chaos everywhere would put the prospect of world socialist revolution firmly on the agenda. However much the generals may wish to use the army to put down revolt on the streets, they would risk mutiny from the rank-and-file, many of whom come from working class backgrounds. I strongly agree with Deborah's argument about using the internet, and I personally do this a lot, during the present non-revolutionary times. Imagine the effect of simultaneous uprisings across the world, including in many Western countries where revolutions aren't supposed to happen (or so we're told).