The intended Portal Guidelines were never approved by a consensus of the Wikipedia community, and we have never had real portal guidelines. We should therefore use common sense, which is discussed in Wikipedia in the essay section Use Common Sense and in the article common sense. The portal guidelines were an effort to codify common sense about portals, and we should still use common sense. It is still a matter of common sense that portals should be about broad subject areas that will attract large numbers of viewers and will attract portal maintainers. (There never was an actual guideline referring to broad subject areas, and the abstract argument that a topic is a broad subject area is both a handwave and meaningless.) Common sense imposes at least a three-part test for portals to satisfy common sense: (1) a broad subject area, demonstrated a posteriori by a breadth of selected articles (not only by an a priori claim that a topic is broad) (the number of articles in appropriate categories is an indication of potential breadth of coverage, but actual breadth of coverage should be required); (2) a large number of viewers, preferably at least 100 a day, but any portal with fewer than 25 a day can be considered to have failed; (3) portal maintenance, (a) with at least two maintainers to provide backup, with a maintenance plan indicating how the portal will be maintained (b) the absence of any errors indicating lack of maintenance (including failure to list dates of death in biographies). Some indication of how any selected articles were selected (e.g., Featured Article or Good Article status, selection by categories, etc.) is also desirable. Any portal that does not pass these common-sense tests is not useful as a navigation tool, for showcasing, or otherwise.
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