The whole idea of taking it to 256GB is fine, but generally speaking the future is a stabilization of size for on device storage. The overwhelming majority of Photos, Music, Video, and user-generated data must be stored in one place in the cloud and then cached intelligently on the device. I long ago gave up trying to duplicate my music and photo collections across devices, duplication which simply drove up the costs of the devices and ultimately ran up against hard technological limits.
Today, I'm very happy with the iCloud Music and Photos Library today and I'm very interested to try the caching available in Sierra. So, yeah 32-64GB is quite comfortable for me and I'm hoping I won't ever need more than a 1TB of flash on my Mac. The real question is... when will I be able to get more than 1TB on iCloud? That's something I'll need soon.
Today, I'm very happy with the iCloud Music and Photos Library today and I'm very interested to try the caching available in Sierra. So, yeah 32-64GB is quite comfortable for me and I'm hoping I won't ever need more than a 1TB of flash on my Mac. The real question is... when will I be able to get more than 1TB on iCloud? That's something I'll need soon.