Not "To be fair..." Bad lyrics aren't an excuse for people's forgetting them.
Touche. It may not be a good song, but those performing in public should probably make a point of remembering all the words nonetheless.
On the other hand church musicians I know contend that because there is so little "public" singing these days and because public school music programs have been gutted, the average vocal range is significantly reduced from that of say fifty years ago.
I remember reading a Web article some time ago about how the advent of studio-recorded music caused a lot of performing musicians quite a lot of upset, because it meant that people who were not good performers could now have successful careers as musicians.
Nowadays, of course, successful studio musicians complain that the advent of the Internet means that people who are not good at scoring recording contracts can have successful careers as musicians. But we've come full circle, I think; the advent of the Internet means that a lot of musicians can make a go of it without the studio labels...but in order to do it they have to be willing to tour almost constantly, a la, say, Jonathan Coulton, one of my favorite musicians.
So it's possible the wheel of fortune has now turned all the way, and we are now returning to a time where an ability to perform well live will become more important to successful musicians.