I would say, at this point, introducing such high RAM standards on the iPad would mainly be used as sort of a window to attempt to bring even more professional grade creation tools to the iPad. Like some iMovie thing that works in Retina resolutions and has larger more memory-hog tools.
I have 4GB on my Mac, and it is great. Though the biggest reason for it is not the multi-tasking, but more for something like iMovie, Final Cut, and Logic Professional. Software for big big projects.
Still, that would start to make this attempt to impede on the function that we specifically use computers for (in a work fashion). I'm not sure iPad is set to take on such stuff. It's a question of focus. Some will be for it, others will not. For various reasons.
On the other hand, the main thing I can sort of see using the Ram on the iPad is to increase the DAW capabilities of the iPad. A platform that is rapidly getting a lot of popularity on the device. Currently, we generally have individual DAWs on the iPad, and some of them work very well and turn the iPad into an individual usable DAW. Though limited, (for those unfamiliar with what I'm talking about) these usually emulate or create an electronic instrument with lots of different sounds being produced (or user crafted) using the instrument's emulated processors. Then they allow themselves to record a performance from said instrument.
The extra ram would allow the DAWs (or at least their brain which handles the sound creation) to be used as plug-ins to a bigger arranger product akin to Logic Pro or ProTools. We already know that the iPad is fast enough to handle them, and even multiple ones going at the same time, as software like NanoStudio has shown. Obviously not to the capacity of a Macbook Pro, but pretty impressive all the same.
I'm actually curious what it would be like if something with iPad Garageband's intuitive arrangement interface could be if it were made to handle DAW plug-ins. Right now, "thanks to the audio clipboard", the main way to use the DAW software with iPad Garageband is to use the DAW instrument app to record your single performance, save it to the audio clipboard, and then bring up Garageband and paste it into an audio track.
Still, the iPad has come a long way for the idea of creating music on it. After some of my initial works, I'm definitely game to creating a digital CD release of just iPad creations.