The scarce traffic on Wikivoyage is not especially surprising: there is a lot of competition in this niche and Wikivoyage is not particularly different in content etc. from some of its competitors.
The evidence accumulated in the last few years suggests that we should accept that Wikivoyage is one of those Wikimedia projects in the lower end of traffic and with little hope for growth (like Wikiversity and Wikinews in most languages). They are still useful for very specific qualitative goals (such as collaboration with institutions which could not have happened on other wikis) and should be assessed against those.
Nemo