Would bringing back extinct animals turn out as badly as it did in 'Jurassic Park'?

On a frigid January night, a Harvard genetics professor with a billowing white beard stood stage left in a theatre on Manhattan's Upper East Side, an icon of the environmentalist movement in a fleece vest beside him. Both men were staring down a toothy problem: How could they convince their counterparts on the stage, along with the 300 people who'd filed into Hunter College's Kaye Playhouse for a debate, that the world should bring back velociraptors or, at the very least, an extinct pigeon?