My belief is that if it the coin doesn't hit any exchange, people will stop mining it, and coins will merely be exchanged for minimal amounts by those who have given up on the coin, to those who are already mining it. People who missed out on the first week of mining may, unfortunately, look at is as a missed-opportunity. There needs to be a public value on an exchange for there to be incentive for new members to mine it.
Having said that, it's just my 2 cents, and I'm absolutely not bothered, either way.