1. Cable TVThough cable providers still have plenty of subscribers — roughly 101 million Americans, in 2015, according to research firm IBISWorld — those numbers are declining.2. Name-brand razorbladesAmericans love their Gillette razorblades — so much so that the shaving giant controls nearly 70% of the nearly $13 billion shaving industry ...3. Bottled waterWho would pay $2 for what amounts to a bottle of tap water?4. Credit monitoring services and identity theft insuranceThe year 2015 saw more than 732 data breaches as of Dec. 8, according to the nonprofit Identity Theft Resource Center — with more than 176 million records...