Don't let the door hit you on the way out. Seriously, iPhones/iPads will never get removable storage of any kind. Might as well jump ship if thats so important to you. For the vast majority of people, storage isn't an issue. And if you're having that much trouble storing stuff on a 64GB iPad, you're an extreme fringe case. Most people don't need their entire digital collection on an iPad, and with iCloud etc local storage is becoming even less of an issue. Adding expandable storage would add more problems and complexities than it would solve, and the general market has shown that it couldn't care less. If I were in Apple's shoes I'd do the exact same thing.
The rest of the industry is also following Apple's lead and moving in that direction. The flagship Android phone- Galaxy Nexus- doesn't have removable storage. Neither does the most popular android tablet, the Galaxy Tab. You're going to have to overlook possibly the best products of the industry if that's your make or break feature.