Halo 4 Map Pack Discussion

I know this is too early to say this but, if/when Halo 4 comes out with a map pack, how will they keep it alive. Like when reach came out with the NOBLE and DEFIANT map packs, after like a month, nobody played them anymore and most of the maps where pretty good. Not to mention the achievements for the map packs…like how are going to get them without boosting if no one plays them anymore.

Just wanted to bring this up because I’m concerned about it.
Anybody else know what I mean?