The knee jerk reaction many of us might have to re-forming a culture similar to Rome is "Oh! Wouldn't that be cool!"
Certainly, some of why Romanization isn't possible has been touched on above.
My opinion is that, if you take a close look at Roman history and civilization, some of its more incredible aspects, like its reliance on and casual acceptance of slavery, taking hostages in war, free gladiator spectacles as public entertainment, the power of the father over the family, its religion, the laws forcing men to marry and women to have children, etc. would overshadow any accomplishments it could achieve. The regime would be viewed as amongst the most notorious in the world and many powerful nations would be chomping at the bit to extinguish it, take its territory and be declared a hero, besides.