The 1.5 or 1 gb of RAM will allow this thing to smoke just about anything. Look at all that was achieved on PS360 with 512. I would be very surprised if the the CPU was ever maxed out in either the 360 or the PS3. Ram was the big bottleneck.
I've been doing PC builds for myself for something like 15 years now. The most recent GPU I replaced was a Radeon 4850 (single stack). Let me tell you, that one radeon still can take anything I throw at it, from CIV 5 to skyrim, and make it look amazing. If the WiiU gets a gpu based on it (or even one more advanced), its not going to have ANY problem pushing 1080p visuals.
I honestly don't see what PS360 can upgrade for a reasonable cost that will significantly overshadow WiiU. I heard that Sony was putting 4k support in the PS4, which I think is very foolish. Everyone just got done rebuying 1080p tvs. There was a huge debate for a very long time whether the human eye could even distinguish between 720p and 1080p at 10 feet. If this rumor is true, look again to a 599 us dollar console with features that nobody will be able to use without dropping 2+ thousand on new equipment. As far as Microsoft, they're more concerned with owning the living room as a set top box that also plays games than they are pushing the envelope.
WiiU may indeed end up being the weakest new platform. But it will be the weakest on the same scale that the PS2 was the weakest. The differences will be minor and negligible when price is factored in.
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