Red links are part of the MediaWiki architecture. They indicate that a
subject has not been covered in an article. Consequently, they are
functional and, a good thing to have.
When you link to a "disambiguation page", there is a chance that there is a
reference to the missing subject, there is however no guarantee. When you
are looking for a given subject, chances are that Wikidata does have an
item for the missing article.
Magnus Manske created a new template on the en.wp named "Redwd" . It
does do two things, it leaves the red link red and, it refers to both
Wikidata and the Reasonator. I blogged about it  and Jane used it on a
disambiguation page .
The template is relatively simple and it can easily be copied to any other
Wikipedia that is interested in this functionality. As it is the first
iteration of this functionality, I am sure that there will be people who
will provide us with improvements to what is already on offer.
I want to thank Magnus for the code and Multichill for the documentation.
PS, the disambiguation by Reasonator will show all items that fit a