I think akryum has done a good job with the Vue 2 integration package. The package has been maintained and stable. Regarding Vue 3, as far as I can see, things have not moved quite as quickly as they might have. But akryum has created the base Vue 3 package and it is available for use (though not sure about any limitations, other than specifically needing Composition API instead of Options API). If the Meteor team and community members can motivate akryum to continue his work with some financial support, then that would probably be the best option. He’s a Vue core team member and, more importantly, has proven that he’s able and willing to maintain important packages not just during the initial excitement period of creating a new package, but also for the (much more dull) long term. And for commercial projects such stability is very important.
A few years ago another member of the Meteor community took it upon himself to (I hope I am recalling correctly here) create a Vue 3 integration for Meteor instead of akryum. That did not work out very well, as often happens in open source, and probably took some wind out of akryum’s sails as well.
In any case, I am very much interested in Vue and Meteor getting along well in the future. As my main projects relies on that. So very good to see the Meteor team showing interest in having the integration in good state!