it is really hard to understand your question!
you talk of second layer solutions of bitcoin, which are currently being developed as we speak. the Lightning Network is ready and it is being tested by thousands of users and it will soon be used by a lot more. that can be used by billions of users!!!
as for priorities, all of them are as important. security, decentralization, usability, speed, cost,... they are all important at the same time. and for example if you sacrifice one thing such as decentralization then you kill the project because we might as well go back and use Visa and PayPal if things like that are sacrificed!
Topic: What project can bring cryptocurrency to 1 billion users? (Read 129 times)
Bitcoin has a good short at ending up as the most valuable coin imo. But...it's going to lag on consumer adoption. It deliberately(and intelligently) prioritizes security and decentralization over usability/ convenience/speed/costs. I think that project must be more usage like Layer 2 solutions. So again, What project can bring cryptocurrency to 1 billion users? 
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