They already slept 5. It allows families to probably sleep in more comfort. That's a great thing. Staying at Poly with my 2 grands I enjoyed that the bed was much better than the old sofa sleepers; better mattress, neater and easier to operate. Very happy BW (one of my home resorts) finally has them.
Being an older resort there are a lot of us 'older' owners around, some since it opened and our needs may not always be to sleep 5 people. Many of us come in multiples of just 1 or 2 people, so no need for a 1 bedroom although it would be nice to have, depending on having enough points for it. Also, if I remember correctly, the 1 bedrooms still sleep four. We don't necessarily want to cook all the time. Personally I also know how to get takeout delivered, how to bring back leftovers or dessert when I want, or how to order some room service. I also know how to open a bottle of wine and sit on my balcony people watching, and probably reminiscing to my partner about the old days.
Also, many of us older owners don't always 'run' for the parks in the morning. We may 'run' around the lake, or walk early in the morning, go to the gym, or just chill while enjoying coffee and maybe a biscotti in our room. Later we may go looking for more adventure or we may go to a park using our annual passes.
Eventually we'll head out for dinner somewhere. And many of us just don't work anymore. But, what a great place to be when you finish working!