Indeed, if my wife and I were to do this once we have children, we would try to strike a middle ground. No outright banning of modern tech, but definitely limiting it. My nieces (12 and 4) each have their own tablet, and the older one has a new computer, Xbox 360, TV bigger than ours, her own cellphone, and no less than three portable gaming consoles. I'm a technology freak; I love to dabble with anything electronic...but in my opinion that's way too much tech for a developing child.
The problem with even partially going tech-free is that you become the outcast, and your children even more so. When I was growing up in the 80s, being the only kid without a Walkman and NES made me the "poor loser kid" on the block, even though financially we were no worse off than our neighbors. In today's world where children learn to read using Leapfrog tablets instead of actual books, the idea of being without some form of electronic device is considered a hardship at best.