Would it be possible for a carrier (Apple) to "serve one type of phone", as the article suggests? I guess the regulator would not allow that, requiring the use of standards (GSM, LTE,..)? On the other hand we do have SIM-locking already..
Second thought: Would a phone that doesn't support native apps, but HTML5, really be called a 'dumbphone'? Running Javascript even requires a faster CPU for the same experience.