I'm a bit torn. The ending of "The Search II" is a cop-out, yes, but it may have been better for the series overall. The introduction of the Dominion moved DS9 into a direction where its episodes might have required multiple episodes of ongoing storytelling, with the DS9 cast facing an impending invasion. However, that was clearly something the creators didn't want to do. And I can understand that. Shows like "Heroes" are composed entirely of ongoing plots; each episode is a chapter of a season-long set of story threads. The result, however, is that no individual episode ever really stands out as a piece of writing, production and performance on its own. DS9 and "Star Trek" in general tend to be about individual episodes. The idea of an ongoing plot across each season was a bit new for "Trek" at the time. The creators were understandably cautious, but at the same time, they wanted ongoing *elements*. "The Search Part II" essentially takes the DS9 cast into the route you'd expect for a season-long, ongoing arc -- and then short-circuits that line of thought abruptly. This allowed the creators to continue doing standalone episodes instead of making every episode about fighting the Dominion.
This was rather disappointing at the time, but I think, overall, DS9 benefitted from holding onto its standalone format. It allowed for individual episodes to later do sequels and continuations to the Dominion plotline, but also allowed for episodes dealing with villains of the week, Bajor's political issues, and the individual cast. Also, the creators were able to use the Dominion's seeming inactivity later on; why doesn't the Dominion just send in squadrons of soldiers to crush Cardassia, the Klingons, the Romulans, and the Federation? It's what you'd expect from "The Search". The answer is shown in the Cardassian/Romulan attack on the Founder's homeworld, and later in the Klingons dissolving their peace-treaty with the Federation, and Starfleet mounting a coup to put Earth under military control. Rather than simply attack in force, the Dominion prefers to maintain the appearance of the status quo (the standalone series format) while manipulating enemy governments into destroying themselves. It's all in the changeling's comments to Sisko in "Paradise Lost":
How many changelings do you think are here on Earth right at this moment? What if I told you there are only four on this entire planet, not counting Constable Odo of course. Think of it. Only four of us, and look at the havoc we've wrought. Four's more than enough. We're smarter than solids... we're better than you... and most importantly, we don't fear you the way you fear us. In the end, it's your fear that will destroy you.
So, yes, "The Search Part II" does feel like a cop-out at the time. However, it's a rather effective wrong-footing in the long term. It gives the impression that the Dominion will be coming in full force to destroy our heroes, only to reveal the Dominion don't plan on doing that at all. And we're left, for a time, thinking that the writers have either ignored the big invasion or are pushing it back for later -- only to discover the Dominion isn't planning a massive strike at all, and their plans are far more subversive and insidious than "The Search Part II" would have you think. The Dominion would rather have their enemies destroy themselves.
- Ibrahim Ng