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So in any case this will be an adventure full of suspense, in which the users starting UASF don't matter much apart from the psychological effects. It will be the miners that have to decide to fork off, and the market that will decide in a risky game.
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I agree there are multiple scenarios and some are risky in worse case scenario UASF will fork away and if problems will rise higher it will change POW.
For safety transition we need 51%+ miners on board but even without it i am so tired of no solution that I would go for it.
That whole mining centralization is way to strong and can not deny development no more.