The problem is it's this or nothing. This isn't 30 years ago when we had competing designs at work. The JSF is it. Unless you think the X-47 can be made into a viable UCAV for all services in the next decade.
Super Hornets will not last to 2050, nor will F-15s, F-16s, or anything else but the F-22. The F-22 will only last till then if we don't lose too many to various things over the decades, seeing as we don't even have 200 of the stupid things.
So, we can spend the money to fix the F-35 or we can make the even more intelligent decision to scrap it totally and start spending money on a totally new design to replace it, spend several billion more dollars in the process, and then find that THAT design also has a ton of issues it needs to fix (because all planes have before it, and all will after it, no doubt).
These stupid "total lifetime cost" estimates crack me up, too. Wow, it's going to cost more than any other plane we've ever had? Really? Maybe it's because we're planning on buying more of them than any plane built in the last 35 years? And then keeping them for like 50 years, longer than any fighter we've still got flying? And that's going to cost more? Really? Those CPAs are worth the taxpayer dollars they cost. Really.
Next: US gov't plan to replace every single car, truck, and van used by GSA in 2013 will cost more than any previous year! Plans to demolish and rebuild every gov't building will result in highest ever construction costs!