Initially, every time a soy farmer support bill died due to a sunset time it could be a media issue. Some big bills will continue to die or be renewed amid a media frenzy; however, our capacity for sensation is limited. Many bills would die quietly. A delightful side effect could be the generation of enough actual news to keep the media busy reporting on useful topics.
A maximum word length or similar requirement sounds good; however, it might not be practical. If you prevented disparate pieces of legislation from being voted on as a single law, a limit on length might work and promote transparency.