Well said @ yabapmatt but I think adding the list of popular tags to the already existing search options tags is quite a great idea to help the new users pick exactly an area of interest easily and the trending should still be there because it shows some people their level of improvement and I encouragements as well.
Another big mistake we the minnows do is not being able to use the correct and suitable tags for our articles thats where the multiple tags comes in to help as well.
Thanks