It's definitely important for employees to want to telecommute, and it's a bad idea to force people to telecommute. But wanting to do it and being suited and capable to do it are two different things. The best approach is to identify your minimum selection criteria and then encourage prospective telecommuters to learn more about the pros and cons of telecommuting.

The objective should be to give them the facts they need to make an informed decision, instead of rushing into it because they're attracted by the idea of being able to avoid the commute, or work in casual clothes, or otherwise enjoy some of the flexibility of telecommuting. Those are important reasons to want to telecommute, but they shouldn't be the basis of the decision.