Of course it can't, but the F-35 was meant to replace the A-10, as well as a host of other fighters (F-16, F-15, F-18, Harrier, and probably more). But with stealth.
Some standardisation in fighter design doesn't sound like a bad idea at all, and you can certainly question why you'd need all three of the F-15, F-16 and F-18. But also the A-10 and the Harrier? Those are very different planes with very different roles. I think cramming those two requirements in there is what sunk the F-35. There's no way to make one fighter do all of that and do it well.
Some standardisation in fighter design doesn't sound like a bad idea at all, and you can certainly question why you'd need all three of the F-15, F-16 and F-18. But also the A-10 and the Harrier? Those are very different planes with very different roles. I think cramming those two requirements in there is what sunk the F-35. There's no way to make one fighter do all of that and do it well.