The microSD slot is one of my favorite features on the Pi. It's so easy to manage configurations, you can write the system to a new card, swap, and even nontechnical people can swap back if needed, and it's all cheap.
If it were up to me, Android phones might be doing the same thing, SD as primary storage, with an OS that was optimized for write cycle preservation. It's just so convenient, simple, and obvious.
I don't want the Pi to try to replace desktops, because it's not going to. I've already got a laptop, I don't need any more bandwidth.
I would prefer it if they added a small capacitor that could carry the SD card though it's internal FTL business on sudden power loss, that could ensure the SD always has power until at least a few ms after the last access. But I'm not sure if that's actually the problem. I just use a script to reduce disk writes(Mounting tmpfses, etc).