It's extendable, and Bloomberg programming APIs and its Excel API are both heavily used. The reason why it won't be extinguished is that it combines the UI/API

It's extendable, and Bloomberg programming APIs and its Excel API are both heavily used. The reason why it won't be extinguished is that it combines the UI/API (which is not great) with market data feeds that are hard to replicate (because parts of it are scraped from bloomberg messages or only available on bloomberg), the instant messaging and chatrooms that also benefit from the moat of network effects, as well as a news service and macro data/company events/balance sheet data that integrate with each other and the market data feeds. You could replace the news service and balance sheet data and some of the data feeds with Reuters Eikon, and the instant chat with Symphony - but they are both subpar products with even weaker UI than Bloomberg.