Somehow, Disney doesn't have problems keeping people moving on every other ride that doesn't have moving walkways, so I think they'd be okay without them, but that aside, changes will occur, they will be occurring soon, and with Jay Rasulo at the helm, you can bet they will be similar to the other four mountains. Ours will be the last mountain to change, so you can bet there will be almost nothing not found in one of the other four mountains (regardless of whether Jay leaves soon, he will more than likely be here when the budget and details are approved).
Anyone who doesn't like DL's new Space Mountain is in a VERY small minority that I doubt Disney cares about. It has been very good for Disneyland's numbers and most people love it and that will be enough for anyone at Disney. Frankly, I think the only decisions that remain are whether or not to update the existing tracks or build something brand new. New trains with audio will happen. New special effects will come. And, we can expect some theming changes (and since even in the current climate at WDW, they were willing to put up that cool new lighting on the Tower of Terror, I would bet we will see lighting used extensively in the new queue area). If they could do something similar to the boiler room in DCA's Tower of Terror, it wouldn't bleed too much into the dome above. Arguing over whether or not these changes will occur is asinine. It has happened/is happening (in the case of Tokyo) to the other four Mountains, so why would anyone think WDW of all places would be immune to change? Have you not walked around Tomorrowland or Future World over the last 10 years?