Earlier quoted context omitted.
When bitcoin first came onto the scene I personally knew a guy who was running a website to act as an exchange. It was small because bitcoin itself at that time was very small. Then bitcoin had its very first dip and it became unprofitable to mine bitcoins. When that happened he shuttered the website and kept everyone's bitcoins. I knew of bitcoin early on due to this guy, but even then I had no interest and consider…
I'd go a step further with the comparison to gold. If everyone would stop mining gold today, gold would retain value (or perhaps even go up in value). On the flipside, if we turned off all bitcoin miners today, bitcoin would go to zero instantly (as its worthless without continuous resources being pumped into it). This is why I'm sympathetic to those who say its ponzi scheme, it only has value because of new resource…
"Mining" in bitcoin means two different things, creating new coins AND adding transactions to the ledger. If mining reward went to 0 (which will actually happen someday), and new coins stopped being created, miners would still be able get a profit from transaction fees, although it wouldn't be "mining" in the same sense as gold.