So what do you think? Will Bitcoin always remain a pure store of value, or can it evolve into a genuine source of passive income in the future?
Bitcoin in itself can not generate passive income. It is first money and even as a store of value like Gold, they don't generate passive incomes.
And I wouldn't consider Bitcoin generating passive income in the future as an upgrade
Because that isn't among what defines money.
Bitcoin is a passive income investment because if you buy and hodli for a long period of time, you will make a good amount of profit which you can take part of your profit and keep your bitcoin investment ongoing.
No, Bitcoin is a decentralized currency. If you check OP's title you would realised they stated without selling
And the OP already state what passive income really mean.