Nav4All == Fools
Whatever the outcome of this complaint, Nav4All still stand accussed of being incredibly shortsighted/naiive by not assuming that the worst might happen, and putting in place plans to switch to another maps provider at short notice.
Any company that is "locked into" a single essential supplier agreement should assume the worst might happen when that essential supplier is purchased by a larger organisation - change is then guaranteed, including the early termination of any ongoing deals (I'm pretty sure such termination terms would be specified in the contract).
Transitioning from one supplier of map data to another cannot be that difficult, there are numerous mapping applications out there already that work with multiple map sources, they're just using slightly different APIs - the point is the underlying data is all the same, it's just packaged slightly differently.
Nav4All as a company is/was just incompetently managed, and that's not Navteqs fault.