That is a very hard problem, unless someone with serious name recognition like Linus Torvalds starts to lead that kind of effort, or a big company like Microsoft suddenly decides that putting 1 billion towards GNU/Linux would be in their interest. With small efforts, it will remain scattered.
Crowdfunding has a lot of power if there is name recognition behind the effort. Star Citizen has already gathered $800 million with mostly enthusiasm and a good start. Who is there to lead the effort for GNU/Linux phone development?