It definitely won’t be tomorrow and will be handled like with any other software too by providing a grace period for new customers when the time comes. Adding new features and games is a lot of work, it’s quite normal that at a certain point an update is not free if you always want the latest version.
I had VORPX since 2014 with a DK2 and got tons of free updates since then. The newest update with direct VR is really amazing and worth more than anything on Oculus home in my opinion. VorpX just has tons or replay value and is well worth the cost more so than any other VR demo or game that I have seen so far.