how wuold you deploy them outside of a holodeck? mobile emitters? that wouldn't work since even B'Ellanna couldn't replicate its technology.
besides, like people said, EMPs or some other dampening field would render them useless.
Quite simple.
Have you seen episode 'Baiscs Part 1' ?
The crew was able to create 3 Talaxian holographic ships as a means of diversion for the Kazon carriers, maintained full shield integrity, maxed out phaser power, photon torpedoes and impulse engines.
I would say they have the means to pull it off, with a bit of thinking that is.
Granted, it was stated the holo-grid in question would be power hungry and the ships never fired, but they were able to pull it off as a diversion tactic to allow Voyager to handle the Kazon (and had that idiotic prisoner not blew himself up, there's a very good chance Voyager would be able to destroy all 4 Kazon carriers instead of just 1).
If SF wanted to pursue this technological implementation in the future, then it stands to reason the power-grid would have to be properly modified.
I would also surmise that if holo ships would fire holo-weapons, safety features would have to be turned-off and power expenditure would be greater compared to just a simple moving target that fires no weapons.
But in-essence, it WOULD be a viable alternative... especially if you are sending just 1 ship into the unknown.
Creating friendly holo ships for small engagements and limited amounts of time would probably be beneficial as far as survival goes.
However, multiple creative ways of deploying existing technologies that could deal a crippling blow to an enemy target were used rarely and not explored in detail.
I agree with another poster for example that dimensional transporters bypass the shields as we know them easily.
Instead of transporting organic matter (which gets damaged with frequent use), why not simply beam photon or quantum torpedoes on-board and blow it up... or reduce the explosive yield significantly so the enemy ship is disabled or crippled.