Datatables should actually be retagged then blacklisted.
The tag wikis might be the same, but datatables gets used for all kinds of things - the jQuery plugin, .NET's DataTable class, database tables, HTML tables, and so on. If we just create a synonym, the jQuery datatables tag will probably have an influx of those questions. I wrote about that in another answer covering the datatables tag and its companions.
To prevent that, we should probably just blacklist it to have people search for another tag to use instead.