Capitalism is simply the idea that we should not use violence to solve nonviolent economic problems. What people get in their heads to do with money, or their attitude towards it, is completely irrelevant to what capitalism is.
Ultimately, yes. Property belongs to whoever most people agree it does, or to whoever has all the guns to enforce it how they like. It's either an inter-subjective consensus, or some kind of fiat. I prefer inter subjective consensus, obviously, since I trust it to eventually reach some kind of productive equilibrium.
You prefer. Though you are not everyone. Meaning the only way for that to be the case all the time (both in your ideal future and the real past) everyone has to feel that same way. Which as we know has not happened, and shows no indication of ever changing.