It's actually rather easy to earn BTC. As long as you have the funds, equipment and time that is. Also, I doubt it could act as a store of value. Sure, it could be a medium, but as a store of value? Nope. It's way too volatile. And even if you consider that the supply is limited, BTC transactions could approach the number 0 and never reach it. Just like how it was said in here:
I think this supply isn't enough for world-wide using and mass adoption
Fortunately, Bitcoin doesn't care what you think. Bitcoin is a voluntary system, if you don't like it, don't use bitcoin. Bitcoin is a voluntary system.
Bitcoin is just a number. If 21 million Bitcoins isn't enough, then how about 21
billion millibitcoin?
If 21 billion millibitcoin isn't enough, then how about 21 trillion microbitcoin?
If 21 trillion microbitcoin isn't enough, then how about 21 quadrillion nanobitcoin?
If 21 quadrillion nanobitcoin isn't enough, then how about 21 quintillion picobitcoin?
See, that's the surprising thing about numbers, they can always be divided resulting in smaller numbers.
So even if the supply IS limited, I doubt it would stand at a single price for the long term, since the supply changes every now and then because of lost wallets/ hacked accounts/forgotten accounts and other stuff like that. There needs to be a solid store of value right now like USD, and stand together with BTC to form an economy, is what I think is needed.