We're not going to be finishing fifth, I think that's fairly assured! Let's say we do end falling down to fourth, I'd rather have that than stay fourth for the whole season with not even the prospect of winning the league. Ordinarily a team has one good run at the title before following it through the next season - so long as we don't lose our best players in the summer, then there would be clear signs of progression.
I really don't think we will fall away though, it seems to me that we just have too much quality in our play for that to be the case this season. Plus we're so much better defensively that what has befallen us in previous seasons, might not have much relevance.