Contract Term has no completion date.

Good day, is it standard for a contract to not have an actual completion of services date? See the clause 'A' bellow. What are the dangers in signing such?

'A'
1.0.Term and Termination.
1.1. This Agreement takes effect immediately as of the Effective Date, and remains in full force and effect until the Contractor has completed the Services (the "Term"), unless earlier terminated under this Section 1.

I would prefer a contract term clause such as:

This agreement takes effect immediately as of the Effective date and
shall continue in full force and effect through December 31st, 2017 or earlier
until the Contractor has completed the Services (the "Term"), unless
earlier terminated under this Section 1.

Advice, please.