Not really, the audience would have been MUCH more accepting of the enemy getting trashed repeatedly if it were an original VOY race and not one from another show.
What evidence is there of this? If they invented an equally insurmountable bad guy and had Voyager trash them what makes you think it would have worked to any greater degree of fanfare? If anything the evidence suggests equally the opposite; 8472 is
exactly what you're talking about and as many people disliked it as liked it.
And yes, they DID have DQ races getting destroyed or assimilated by the Borg in VOY to keep up their menace, and it STILL didn't work.
Was there any scene that rivaled or looked like the one I was talking about where the Cardassians and Romulans get sent their packing orders by the Dominion? No. Could there easily have been? Yes. So to establish the Borg menace, or reiterate it as you say is essential (which I don't agree with but for the sake of the conversation I'll run with) wouldn't the destruction of a race, shown in detail that Voyager later finds evidence of, be the perfect way to do that?
The Dominion was shown to be tough, but very much NOT invincible. That's another key difference.
Actually, they created the destruction of the Odyssey scene
specifically to get the idea across that the Dominion were tougher than anything seen on TNG, with perhaps the exception being the Borg. The Borg were
way more beatable based on what had been done in the past than the Dominion were when the first showed up.
It's near-impossible to keep them invincible but not
completely impossible as per your statement. Of course the Borg have to be beaten... but they don't have to get bitch slapped in such a fashion that they seem harmless only to show up later. Being beaten doesn't necessarily take all the wind out of ones sails. Just beating them a few times isn't the problem. They could have remained scary after that were it not for the
way in which they were beaten (ways which seemingly became sillier each time.) Then you add to the fact that the Doctor basically cured assimilation and the Captain decided it was a good idea to hunt some Borg down for scrap. That has nothing to do with who wins or loses just that by virtue of what was presented the Borg lost some of their "BOOYA" power (I don't know what that means... its just what came out.)
-Withers-