Yeah, but what is supposed to change the skyline in the Alternate Reality (except the concept artist, lol)? In my opinion, Nero's attack is not enough. The Kelvin is just a spaceship with 800 officers. If you sink an aircraft carrier, it will have no effect on how the skyline of New York will look.
There's more to it than that:
- Kelvin has shuttles
- Shuttles have sensors
- Starfleet has investigators and Engineers
- Engineers can look at those scans and get ideas
- The ideas mean different individuals are doing different things
- That leads to all of the differences seen over 25 years since.
This is not as far-fetched as the sudden appearances of Ridges on Klingons, or Starfleet's change of style to the point of being almost unrecognizable in 6 years.
Why do you accept one, but not the other? That is illogical, and strikes me as being based on a personal bias.
If past Trek is the standard, let it BE the standard.
Personally, I am not happy at all that the TOS design still exists. The proper visual existance of Star Trek starts with The Motion Picture for me. Which is why Klingons without ridges shouldn't exist in my opinion (and as far as I know, Roddenberry was fine with that, too). And everything was perfectly fine, until they decided to let TOS design appear in TNG/DS9 episodes. There we suddenly had Worf with ridges, altogether with smooth forehead Klingons, in one scene. Bad move. And it got even worse when they made this virus explanation. I really don't like that.
Same goes for Starfleet's style. I find it reasonable that they sometimes change their uniform designs. It happens in real life, too (not that often, though). Ship designs are pretty much consistent anyway. The change from TOS to TMP design has been explained with a refit. But in a way, it's just like the Klingon ridges: they were always supposed to look like that, but the budget wasn't there.
But I really can't think of a reasonable connection between the Kelvin's destruction and the look of the San Francisco skyline. The construction of buildings comes with population growth, the style of administration of the city, and so forth. The destruction of a space ship doesn't change that. And it also makes no sense to have huge 5th element style skyscrapers in the 2250s, and have them completely removed in the 2270s.
You could argue that's also a budget issue. But they had plently of opportunities to create matte paintings of a much, much different skyline, and they didn't. And then there's such things like Sulu's comment on the look of the city, and the idea that Earth is an utopic paradise where there are no such things as megacities.
The thing is, the difference with the San Francisco skyline is something which is irrelevent. An alternate reality started, and a lot of technicians and architects made different choices. Not all of them can, not should, be explained, and we've never seen San Francisco in 2258.
How do you explain how Vulcan's appearance changed so completely between ST: TMP and Star Trek III, and IV?
If the movies are the true starting point, this must be addressed before the San Francisco argument can really be applied.
I do not see the presense of large buildings in a city that is the heart of Starfleet, and all of the supporting infrastructure necessary for that, precludes Earth being a virtual paradise.
For all we know, San Francisco may have looked like that gradually over time, but an accident occurred where the seismic controls that prevent Earthquakes may have failed, and the buildings devastated.
Then, the city decides to pay homage to it's past and rebuild the city in an older style, recreating much of what we've seen in the rest of Trek.
If it really needs addressing, there are creative ways to explain the inconsistency.
Looking at Vulcan:
It is possible that in the few occasions we have seen vulcan, it could have been during more stormy seasons, during which the Red sky is almost always present.
During events of the movie, Vulcan's position in it's orbit may have placed it at a slightly more distant point from it's star, allowing the storms to settle, and the skies to clear.
This might also explain how Vulcan has changed appearance so often when seen from Space, and would not be that unreasonable when one looks at Mars.
You may be right in that not everything can be explained by the Narada altering the timeline, but with a little imagination, the differences are still plausible, even if not explained.