(MacArthur has matured a lot over time. He has come a long ways from his dispensational roots. He has left the Amyrauldian position, and I think he will eventually leave dispensationalism entirely. One of these days, MacArthur is going to realize that John 5 and 2 Peter 3 completely rule out his eschatological position. Then he will reconsider all of the rest of the amillennial arguments--and realize that they are correct, too!
In the meantime, MacArthur is a much more reliable preacher of conversion than the mainstream dispensationalists are. Sometimes I think the mainstream dispensationalists don't really believe in conversion.)