People are confusing the OS and the dashboard.
Yes, they have IE.
And they're locked into 32MB for compatibility reasons.
Dashboard and any apps can take free reign on memory
The memory used by the OS (guide, communications, networking, audio, visual, etc) is capped at 32 MB while a game is running, an app is running, whatever.
It's always possible to decrease the footprint of the OS but its 100% impossible to increase it
PS3 OS used a ridiculous 96 MB of ram in game operation at one time and they finally got it down to 52 MB or something... Still too hard on a system with split ram pools.
I am not sure what wii-u is doing with that memory if its allocation is true- I seriously doubt it is. 1GB is so overkill, you can run windows 7 with that size of allocation.
And on another note... Imagine what MS could be pulling off with 8x their memory footprint