The black death spread all across Europe and to some degree, the world, even without modern conveniences... and 1/3 of the world's total population died. Up to 60% of Europe's in some areas. A population loss that took 200 years to recover.
People are still interconnected and always have been, and will continue to be. Man is social. Man knows that crossing the water (remember the bubonic plague spread to Europe via rats on ships filled with goods coming from the orient) means he can have teas and spices and more that he cannot grow or make on his own...
People in cities will always need food from countries and people from countries will always need goods from cities.
People are interconnected. All your doing is saying you'd rather see MORE people die because you'd like to see the modern world go back into a dark ages and throw this country into poverty and chaos.
That will cause more death, not less.
There's a lot that can be said for modernity, we've eradicated many diseases, lengthened people's life expectancy and have generally made it to where people aren't living as hand to mouth as they once did - one drought back in the day meant starvation, today, just another bump in the road.
Romanticizing the past is lovely, in a story book... not so lovely if your living in it. Be careful what you wish for, because you just might get it.