I 2.0 is not an 'alarm clock' intrusion system. I 1.0 was, where the intrusions happened every 3 days, and you had to defend each one or lose the outpost. However, there really was no penalty for losing the outpost since you couldn't get locked out or prevent your enemies from docking. A strong alliance would prevent the intruder from actually using the Island, and then drive them out at the next Intrusion that fell in the proper time zone. It took a couple of months for corps/alliances to figure that out, at which point the large intrusion battles and alarm clocking basically stopped.

Currently, the issue with intrusions is simply that corporations strong enough to take and keep an outpost, already have one (or more). While there's incetive to attack other corps SAP's to generate PVP, actually reducing the outpost to 0 and then defending it up to 50% to lock them out is tedious; with no actual reward other than having one more set of SAP's to defend.

Any change of outpost retention mechanics will have similar issues, defending will always be boring.

The paradigm shift here will be with the introduction of the Gamma outposts. What really needs to change however, is the 'why' of owning an outpost and not the 'how', especially one that is destructable.

If gamma weren't being released, I would support some kind of change to both the "how" and the "why" for beta outposts, but really the focus of PVP will shift to gamma, especially for attackers because even with the little we know now, there are incetives to attack; destruction of property and possibly main terminal loot.

The issues brought up with gamma so far, at least by me, focus on the fact that you can't alarm-clock defend if there are not timer based defense mechanisms. And while not having alarm-clock defense sounds great, without timers you end up with a 24/7 Call To Arms type defense.

tl-dr; Gamma is going to drastically change PVP, how players use the current beta outposts will change, so suggestions to modify beta now could be totally irrelevant after the expansion.