The web has already crushed a bunch of 'owned' platforms that had strong-willed, deep-pocketed stewards. A good run for iOS, and a few features where the web lags, doesn't change the immense power of the web commons platform. The things proven-out by adjacent proprietary platforms will be assimilated, in a few years' time — plenty of time for multivendor adoption and mass-market usership.

(It won't be standards bodies that lead the way — they never do. At best they can codify consensus after the fact, and lightly shame laggards. Instead a rotating selection of innovators, in different categories, will drive change.)