At this point, it is obvious that VNAV is possible for Infinite flight. There are several third-party apps out there such as VirtualLink, IF-Assistant, FMC, that all have or will have VNAV features. However, the VNAV Feature Request on the IFC is still open and has more than 150 votes. This puts FDS in an uncomfortable position if they ever consider adding a VNAV system in the app. If they do chose to do this, they will most likely crumble the business of the VNAV third-party apps. However, this could also attract more users and make the community happy. If FDS choses not to implement VNAV into IF, they show that they support the third-party VNAV apps (or that they just don’t want to add VNAV).
The big question is: does FDS value third-party IF apps enough to withhold releasing a VNAV system in game, or would they implement it, causing the third party apps to lose business?