i think it would be cool if they made a dlc of the capital wasteland in dc where you go back there, im not sure what they could involve but maybe deal with some enclave re visit vault 101 i dont know.............. suggestions?

Too far.
No reason.
If you want Capital Wasteland then play Fallout 3 or wait for Fallout 4 and hope it has a map node system.

Oh, and we have a thread for DLC suggestions here: http://www.gamesas.com/index.php?/topic/1176774-future-dlc-suggestions-8/

wrong forum.
They have already announced all (maybe most) of the DLC. Honest Hearts, Old World Blues, and Lonesome Road.
I don't think that there will be any other after those three.
And, a DLC in DC is like Fallout 3 all over again, but with new content. If you want to go to DC so bad, them play Fallout 3 again....nothing wrong with that.

Please use the linked thread. Thanks.