Ive listened since di started, and through DI have become business partners with DJ Lithium who people who have listened to di will probably of heard of.
I can tell you now, DI will not remain free in the future, I cannot give you a timespan but there was talk of introducing such a service and phasing out the free service well over 18 months ago.
The people behind the scenes at di have no idea what they are doing, they are not intelligent, and they do not listen to what people say.
I have spoken with Ari on many occaisions trying to get him to do certain things, the same reply leads to the same result > nothing.
DI used to be ok, a while ago, now i rarely listen to it, which is a shame because provided the right people were there with the right ideas, di could be massive by now, instead I can see di slowly progressing on a down hill slope to the point where they will have no listeners.
I could write an essay on what happens behind the scenes, what has happened, stuff involving law suits etc and many other problems invoking what types of music people want (Didnt get) it could go on and on and on, so ill stop here and just say its a shame.
Edit: Oh in answer to what you said in simple terms, yes the free streams will either go, or be reduced to something pathetic like 56k