With even the upgrades on the F-16 being conceived as a threat to the F-35, using up F-35 money, it's unlikely new F-16s will be ordered by the USAF. LM did a great job at offering the latest tech on the F-16 for export customer, even beyond the US needs. You can see that the lack of upgrades to protect a new fighter also happened with the F-15, only now that the F-22 introduction is well underway, upgrades are finally funded, because they won't get enough F-22s. Boeing also did great by taking the F-15E and turning it into an attractive proposition for allies looking for something more capable than the F-16, but not to the same extent as LM did with the F-16.
One argument provided in the article to favor the F-16 as ally is that of cooperation and compatability with the US. But I'm not sure how that works out for all the customers who have been buying the F-16 in the last decade or so. They'll be flying non-stealth F-16s long after the US and others have gone stealthy. And the bulky, heavier, slower 'tricked out' F-16, might have trouble keeping up. Now, how will this argument work out then, I am not sure. I'd say, if you're shopping now, and the F-35 is out of reach, then only select the F-16 for its quality/price compared to others or as interim. But you might as well go for any other NATO compatible fighter.
My point, even if F-16 production lines would have closed, the F-35 would still have a hard time.
@nonpilot
I think it still has to surpass the F-4 as well...? Although in the sense that today's fleets have become smaller, I think the F-16 success has already passed both the F-4 and MiG-21. The F-35's time still has to come, you never know, another Cold War, the arms race in the middle-east, possible arms race in Asia with US as main supplier, and it might easily become the winner they envisage it to become.
@ Valkyrian
Why didn't MDD do well? Because it merged with Boeing?