What grammatical elements are contained in the sentence 你不听不就得了? A book on function words contains the example sentence:

管他说什么呢， 你不听不就得了。

The first part is simple: 管他说什么呢 = "no matter what" s.o. says (管 as conjunction). The second part however is unclear to me. Is there some special pattern, complement or whatever contained?
The components are:


你不听: "you don't listen", of course.
不就 ... (吗): colloquial element, "isn't just that...?", "nothing other than..."
(analyzed into 就 + rhetorical question)
得了: colloquial element, "fine with it", "enough"


Put all together:


  你不听不就得了(吗)
  lit. You don't listen to him, then isn't it just fine?
  "Why don't you just ignore him!" or "Is there any problem with ignoring him?"