"Stealth" often comes as a trade-off.
Is the loss in some areas worth the gain ? That is what is being asked.
Low-observable technologies depend on a precarious set of circumstances to function and have the advantage. If that was to be suddenly negated by technological developments in the world of IADS, you are left with a less capable aircraft that is no longer "undetectable".
The F-35 is planed to have some impressive technology that will give it capabilities that are a leap forward, even if "stealth" were to cease to be an advantage. "Stealth" will eventually be defeated, of this i have no doubt, and that day is not that far off.