I think you'll find it's long been that way, regardless of size of following. I personally hate the sky blue song for its repetition. I've said it before and it pains me to say it, but I think on the whole we are a pretty timid and unimaginative bunch. Many times over the years I've tried to get new songs/chants going (often daft/mildly amusing but none involving incestuous relations) even reprising some old ones from the 1970's but it would appear you can't beat the two old favourites!
Timid? Sorry, but that's tosh. Our away following is very vocal and was praised endlessly last season by fans of other clubs. Timid is not a word I would use to describe our following at all. It's amazing how many sets of supporters turn up at away games, sit down with arms folded and do nothing all game. I am constantly surprised at how shit most away followings are compared to ours.
I read a comment from a Bournemouth fan the other day criticising the quality of the support so far this season in the Championship, comparing them to us last season who he described as 'phenomenal'.
Why are we so hard on ourselves all the time? I've never heard Leicester fans whine about the fact their dreary away support has a repertoire that consists of 'Les-toh, Les-toh, Les-toh' and pretty much nothing else.