Physics are already getting in the way, that's why we have FinFET, tri-gates, and likely GAAFET (Gate All Around) in the near future. All of these technologies

Physics are already getting in the way, that's why we have FinFET, tri-gates, and likely GAAFET (Gate All Around) in the near future. All of these technologies in fab processes are already in high use to combat quantum tunneling and current leakage.