Sir Elton John, a true giant and pioneer in the music industry, wishes people would write better songs.
I wish the same thing but I think that listeners drive the market more than he's acknowledging. If people listened to better music and paid for it, the songwriters would certainly write more of it.
So the first step is to stop dumbing down the population. And unfortunately pop culture is one of the most potent forces in dumbing down the population.
Sadly, writing smart, challenging music, can drive an audience away in record time in today's world. It's not like it was in the 60's when Sir Elton came of musical age.
So just Stop It!