Stealth, what is it worth?

It appears to me that fighter design is largely focussed on achieving stealth.

My question is treefold:

1. What is the value of an F-22, or a F-35, if we would strip it from its stealth capacity?

Does it hold any ground against present day gripen, rafale, f-16, su-27, typhoon… if its steatlh property would be drastically compromised?

2. How much time before someone develops a “stealth detector”.
In the age of net centric warfare, this detector could be the size of a bus, there is no need to have it on board of a plane anyway

3. a stealth detector, what are the most likely technologies for such a thing?