It's been established that whatever Nation is doing isn't involving anything planetside at this point, so the only ~things~ they're doing are in space. What those ~things~ are, nobody knows. Not even the Nation loyalists know IC - so however much they scream and stamp their feet, their assumptions and theories are just as pointless, unfounded and potentially irrelevant as those of anyone else.
Something we have to accept as players is that a storyline, once made into a game mechanic, cannot end without serious concerted effort on CCP's part to provide a replacement or seriously expand upon them. Faction Warfare will never end. Incursions will never end. Wormholes and Sleepers will never go away. Why? They're the flagship Jesus Features of expansions. And the odds of them being expanded upon in a way that changes the course of the storyline away from where it is are low, because it effectively requires an expansion's worth of effort - especially in the case of Incursions.
It's often argued that just because you don't see anything happening, it doesn't mean that nothing is happening. I'd caution others to consider the situation externally and point out that sometimes when you see nothing happening, it is precisely because nothing is happening.
Onwards to incursion community stuff.
The reason that nullsec incursions are typically left alone is because they simply do not cause enough of a hinderance to normal operations to be worth clearing. Whoop de fucking do, we can't use systems here as cyno waypoints for a week. We'll find another way around with our MASSIVE FUCKING JUMP BRIDGE NETWORK AMIRITE?
Lowsec incursions are left alone for those reasons, which also precipitate the usual excuse: other capsuleers. Incursions are such a minor nuisance that the stigma against PVE means that lowsec dwellers would rather use the incursions as bait to bring in killmails than they would to actually make money.
If incursions were mindblowingly crippling events for the constellations playing host to them that week, they would probably not be farmed for that long. As it stands, it's just a reduction in bounty payouts, resists and DPS. Not exactly too much a big deal, especially in highsec where the influence meter gets ground down to zero within the first day of the incursion spawning.