Biggest improvements that will come in Multi Crew for ED should be much much better instancing.
But until we can do raids, free prisoners, capture base scanarios, infiltrate, ship take over by passengers, I don't see the point, it just another piece in elite dangerous puzzle that the player base will find some use for.
Same as space legs, the balancing will be allowing to people who just want to stay in their ships the ability to stay in their ships and do everything, whilst also giving something extra for those who want to walk about, easier exploration of caves which braben pretty much confirm coming in the 24hr live stream, or finding secret missions amongst the space station crew such as tip off for lost cargo ships, secret bases, or just general gossip that might lead to something if you decide to follow it.
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Some will never reach that point, I'm expecting to see :
"Chris is still working on the vision in his spare time"
"Chris is a millionaire he's financing completing the vision on his own"
"The assets are so valuable it's just a matter of time before another developer buys it up and hires Chris to complete it"
I could imagine someone buying up the assets.
But no publisher or game company in the gaming industry will ever work with or hire Christ, he destroyed his reputation in the gaming industry in the 90s and early 00s. They will instead bring in a team specifically geared up to get the project out of the door and money rolling in to repay their buy out costs, which will be cents on a dollar of the 140 million plus put in to the project to date.