Netherlands not buying A's would impact, as would Italy changing their buy. But the politicians have to remember that LM have it in writing that pulling out of the buy affects the industrial share of the build allotted to that country. As such any removal of aircraft would cost aerospace industry jobs.
Precisely that argument has come around a full 360° and bit the proponnents of the JSF in Holland severely in the ass.
The fear that LM can easily relocate work ,that was originally planned to be done in the Netherlands, to other sites in the US or other partner nations is indicative of the fairly low cutting edge technical level of involvement of the Dutch companies involved.
The US , and Bae in the UK/US, have made sure that almost all, if not all, relevant high tech technology stays in house while contributing tier 2 and 3 nations design/produce almost nothing which is cutting edge and gives them an edge in future projects, the only noteable exception seems to be Elbit from Israel, and a couple of optional pieces like eg. the Norwegian JSM.
Fact is that the F16's will need to be replaced and there are much more and interesting pieces of the pie to be had if countries like Holland choose to go with other projects ,like the RAFALE or EF or Gripen or F15, F18 or the F16V.
Many main and important subsystems need to be upgraded or developped from the ground up giving ample opportunities for the Dutch defense industry to participate when they decide upon what plane should replace their F16's.
This time they would have the opportunity to be invested in all kinds of interesting, and later useable in other business opportunities, technologies iso of being a cheap low tech-parts supplier of nothing but the F35.
The worldwide aftermarket for upgrades on the legacy fighters will be huge and those that don't have the expertise and equipment in house will have no part of it.
eg, hypothetically,... let's assume Holland, Belgium and Denmark (forget about Norway, they're to far up LM's ass) team up once again and decide to get involved in one of the running projects, let's say, for the sake of argument, the EF.
Their is enormous potential and opportunity on almost all fronts, weapons integration, Avionics apgrades, Radar, Pod's, engines, TVC, Ram materials, redesiging tailend, wingupgrades, etc, etc ,etc...... .