Don't forget UCAV's such as the Lockheed Polecat or, more likely, the Boeing Phantom Ray can perform the F-117's mission too. The former had been in use for some time before it was revealed, the second is, as yet, a demonstrator in the same mould as the BAE Taranis but, I'll' wager, further developed thanks to X plane experience. The F-117, by today's perspective, is a big and expensive way to do not-very-much.