I've just noticed on HitFilm Pro's forum a teaser from earlier this month for the upcoming HitFilm Pro 15 release this July:

https://fxhome.com/forum/discussion/53305/what-does-hitfilm-15-pro-have-to-offer#latest

Featured is a new Stabiliser FX.

For those who purchase Vegas POST 18 next month - or who then have a current Vegas Post 365 subscription - there is the possibility that this FX will flow through to Vegas Effects (though that's speculation of course). But, if the new FX is included with a new release of Vegas Effects, then there'll be another avenue for stabilisation in Post..