Is our use of menu_alter incompatible with fallback to core search?

It is puzzling to me that q=search/node should call apachesolr_search_view(). This is precisely what happens, though, and one side effect is that the browse blocks in #457826: On empty search, show enabled filters to start a search show up on search/node, with facet link URLs that start with search/node (this can't work, obviously). I think this might be a regression that prevents the proper functioning of the fallback to core search when Solr is unavailable. In any case, we should answer the question, "Is it a bug that q=search/node calls apachesolr_search_view()?"