Like everything else in show business there are a plethora of reasons for tours not happening.
Some tours are announced during Tony campaigns since one of the largest bloc of voters is road presenters. Some times they tour, sometimes not.
Some tours are announced and do go out. They just go for a few dates here and there. Doubt with Cherry Jones picked the cities they were sure they could get the houses they wanted. They did not do a comprehensive tour.
Any number of shows announce tours and then discover that there isn't enough interest shown by promotors or an unwillingness to meet the guanantees set. In my days as a production assistant, lo these many decades ago, we would send out feelers for all sorts of things. Most wouldn't get a bite. Would-be offerings like An Ideal Husband by Wilde years and years before the successful Broadway stand, a reconception of The Fantasticks setting it in a circus and a production of the two-hander Dear Liar with actors who were anything but stars, to name but three.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher
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