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The conclusion seems a bit simplistic. Incubators seems like a very sensible means to an end - for a while. Banks and others who set up incubators do so because they feel the need to accelerate innovation and to gain knowledge about how to apply new technologies and business models. 

In a few years' time they will have internalised a lot of the required knowledge and they will be able to do the more targeted investment suggested in this post. But they have that experience or confidence today so they need something wider to seek inspiration and learn. 

Incubators are an appropriate remedy now to help change big banks. But in a few years the successful banks will look different and have more well-defined specific needs which start-ups may fulfil.