Well it would be viable - for a movie at least - if the mad scientists genetically improved the raptors to the point of human intelligence and sapience with communication skills to match.DInosaurs would be shit.
Our ancient forebears, with nothing but pointy sticks, wiped out woolly mammoths and sabre-tooth tigers, and thoroughly dominated just about every other major creature when they set their minds to it. Who on earth could believe dinos, even with fancy genetic engineering, would stand a chance if we felt like exterminating them? If one guy with a rocket launcher can destroy a tank, one guy with a rocket launcher can kill any dinosaur. One guy with a sniper rifle, hit the right spot, dead / crippled T-Rex. Or a dozen guys with assault rifles and a few spare clips will do the job.
Sure, a few modest sized dinos up to around bear size might be able to survive in far wilderness where they're too much effort to hunt, and small ones that could breed and hide like cats, dogs, rats, fine. All the others are toast at our leisure.
And given that, you can imagine how I feel about dinosaurs on a battlefield. Elephants were rendered obsolete by the Romans. What amounts to something about the mass of an elephant (but with big teeth) isn't much of an improvement, plus the same problems of making sure it doesn't turn round and chow down on your own troops. A velociraptor is just a guy bringing a knife to a gunfight.
But at the point you’re not making Jurassic Park, you’re making a shitty version of Dinosaucers.