I doubt they will...
As long as they do not use it as an excuse to gimp the internal storage, an SD card would be a great option to have. I use mine just for media and backups. I want my app install data on the internal storage, but there is no reason not to have media, documents, random files, ect on an sd card. It gives you another option for transfer to other devices and is not lost if your phone fails.
For someone like me who is paranoid about cloud reliability and security, having stuff backed up on physical media is a must.