Yes, if a link stops working whether to Ancestry or any other source it doesn't provide any information.
In this case Debbie asked about using the sources she has on her Ancestry tree. And having a simple way of providing that information.
Yes the additional details of the information such as:
1900 United States Federal Census for Michael Smith, birth date, birth place, current residence, marriage year, occupation etc, etc could be added as more information about the person either instead of a link, or in addition to a link.