What to do with the B-2 !

Their have always been serious thoughts to buy an extra lot of B-2A spirit bombers to take some weight of the small 21-spirit force now in service. Offcourse the high price was a serious turn-off. But even if the money would be availible now would it be worth to spend such huge soms of money. I think of the new S-400 wich is claimed to be aible to detect stealth-aircraft.

Is this the reason why interst is going now into devellopping a new bomber which will concentrate more on very high altitude than stealth ?

Have the Boeing X-45 project and the Northrop-grumman Future-strike aircraft (DARPA’s quiet Supersonic Platform programme) something to do with this new bomberinterest or are those projects more related to a F-111 replacement ?