Well, this is the dilemma, isn't it? You try to make a movie that's not about a threat to Earth, and you end up with the who-cares-about-these-people? aspect of Insurrection. You do threaten Earth, and diminishing returns are the result: Nemesis, AbramsTrek 1, AbramsTrek 2 (or perhaps all three are equally bad, storywise).
Those three all have villains. But the non-villain threat to Earth plot has already been done twice (TMP and Voyage Home).
I'm just tired of threat-to-Earth stories, and if that means no more Trek feature films I'd want to see, then so be it.
This is one area where I think the movies created 'format decay'. A little theory of mine...
The original Star Trek Writer's Guide from the 1960's stipulated quite clearly, and I quote:
What is Earth like in STAR TREK'S CENTURY?
For one thing, we'll never take a story back there and therefore don't expect to get into subjects which would create great problems, technical or otherwise.
Gene Roddenberry's feeling about Star Trek, as a format, is that the Enterprise exists in an autonomous zone, far away from 'central command' back at Earth. The Star Trek format is about exploring the strange and wonderful "out there" of space. The Star Trek format was not intended to use Earth as some kind of central base from which the Enterprise begins and ends every mission, as do so many other science fiction franchises.
THE MOTION PICTURE constitutes a breaking of this rule. But it is very much set up to be the exception rather than the norm. Earth is threatened in this story, but the only reason that Earth is even in the story at all is as a means to an end. The Enterprise is newly refit, and what we see here is something we never got to see in TOS: the ship leaving spacedock on her 'first' mission. That alone gives Earth a justification to be the central location of the story and, by extension, for the script to put the Earth (the center of the Federation itself) under threat. Nice dramatic premise, even if on paper it isn't necessarily very 'Star Trek'.
The problem begins with subsequent movies.
THE WRATH OF KHAN uses a similar modus operandi to
TMP, but this time because the Enterprise is 'attached' to Starfleet Academy, ergo a Earth-bound ship. Besides, it borrows from
TMP the conceit of Admiral Kirk as a desk jockey at Starfleet Command, so by necessity an Earth setting was required.
But each subsequent movie, Earth is the starting point, a fixed location in the Enterprise's mission. She returns 'home' in
THE SEARCH FOR SPOCK, a new Enterprise is relaunched in
THE VOYAGE HOME, and our crew are recalled from Earth in both
THE FINAL FRONTIER and
THE UNDISCOVERED COUNTRY. On many of these occasions, by dramatic necessity Earth and it's surrounds are central locations, and on two of them Earth itself is directly threatened.
The movies basically took Star Trek into a different zone of storytelling. One fixed upon Earth. Now, I'm not saying that's a bad thing, but it was clearly a contradiction of the original Star Trek format. A justified contradiction in it's way. But by 2002, when
NEMESIS was being made, I think "Earth is threatened" is just accepted as something Star Trek movies 'do'. Certainly the modern JJverse movies have done nothing to dispell the cliche.