The Cat and Mouse Nature of Things
I've been thinking; this is quite a cat and mouse game we're playing with Niantic here. While as of this moment, we are winning over the Unknown6 wrench, it is going to be very much an up-hill battle from this point forth. However, conturary to what is largely believed, I don't believe new UnknownVars would be the big issue we'd need to deal with in the long run, but rather, the accessibility of data.
As Niantic clamp down with IP banning on the various Cloud service providers, and rate limiting on residential connections, it will become increasingly more difficult for services such as PokeVision and FastPokeMap to operate. Compound that with everyone wanting their own piece of the pie in having accurate scanners for their own areas of interest, we get more and more people running multiple accounts on their own systems, covering overlapping areas, increasing the loads on Niantic's servers, further forcing them to clamp down harder, and thus creating an ever lasting vicious cycle.
There are several parties on the right track to address this issue. SkipLagged and various community have proposed and even implemented centralized systems where people can contribute data. However, from my perspective, the correct long term solution have not been implemented yet. These centralized systems all tends to limit how these centrally collected data could be accessed (typically through their website with some sort of ulterior motive be it donations or promote their other commercial services). Furthermore, short from the first party implemented these solutions, no one can on-demand request for map updates of certain region (going back to the centralized display).
It is nobel to think that "Maybe people will stop using scanners and maps once Niantic fixes the in game tracking", but all it takes is one missed Snorlax, Lapras or Dragonite, and we're all back to square one. So, short of Niantic coming up with a read-only API with realtime spawn data, which they've already made it very clear that they don't want to do, the cat and mouse game continues.