I have 12GB and I still have a lot of room left after I removed my SpongeBob season 5 collection. Yes some people has tons of MP3, but, if you dont listen them every month, might as well just put it on the cloud. 32 GB is not bad. You may want more, but, it is not bad.
I figured the impending trend is to stream music to your device. Heck, I just go to YouTube these days to listen to soundtracks. Like RAM is a cache for your Hard Drive, your Hard Drive is simply a cache for the internet, and so the limited storage in a smartphone seems to just be the buffer for your entire music collection.