Well, honestly, IC hasn't done anything aside from Sins, so for it to get off to such a start is definitely great, but from their perspective, they've gotta do something else. Sins does have a limited appeal, so they need to tap the rest of the market. If they come back to Sins, it will likely be after another game or two has been produced. If this is the case, then given the speed and size of IC, it will likely be about 8-10 years (I'm being more realistic than my previous estimate as that was a minimum) meaning that computers will run roughly ~64 times faster than they currently do, which means that Sins would be transformed from a good game with good graphics to an awesome game with spectacular graphics.
We've seen the retina display of the Iphone 4. We've seen the polygon counts of Crysis. Combine that with knowledge that a computer would be ~512 times more powerful than when Sins I was created. End result? A really freaking elaborate graphics with additional space for ships/structures.
Let's say that polygon counts get quintupled. This would vastly increase the realism of the ships up close. Skins would stay more or less the same. Perhaps increasing in size of the files by 4x. The biggest things are going to be particle effects and more realistic ship functions... First off, let's look at DMM from Star Wars: The Force Unleashed. It allows you to use algorithms to determine the way something will break, shatter, bend, etc. Now, polygons have a rival that may or may not come to fruition. These are points. Each point is placed by a programmer and what they allow is for infinite complexity in shapes regardless of how far you zoom in without draining much of the processor. Merge those two things and you can have incredibly accurate cloud based effects. Surface area of ships suddenly could be used to determine the effectiveness of Repair Cloud. Beam weapons would be more accurate. Above all, shielding would be the most impacted as it would allow you to treat it as a fluid (which plasma shields are) rather than a static structure that is on or off.
Now, in Sins II, this things are unlikely to have truly far reaching effects. They will be there to some extent, but only once my kids start playing games like this (35 years down the road probably) would this really come into play in full force. By then, Moore's law states that computers will be about 8 million times more powerful than they are now. That means that by the time Sins V comes out, particle effects and fluid shield dynamics will have effectively reached the maximum beyond which there is little point of advancement.
Ehh, I'm getting off subject, so I'll shut up now...