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mmm it depends. it's really hard for me to answer without knowing your site but I would say that you're in the good direction. You want to provide google more ways to reach your quality content. Now do you have any other page that is bringing bots there via a normal user navigation or is it all search driven? While google can crawl pages that discovered via internal/external links it can't reproduce searches by typing in your nav bar, so I doubt those pages should be extremely valuable unless you link to them somehow. In that case you may want to keep google crawling them. A different thing would be if you want to "index" them, as being searches they are probably aggregating different information already present on the site. For indexation purposes you may want to keep them out of the index while still allowing the bot to run through them. Again beware of the crawl budget, you don't want google to be wandering around millions of search results instead of your money pages, unless you're able to let them crawl only a sub portion of that. I hope this made sense