What do you think would be realistic to expect out of a successor to Wii? Tell me when you think it will come out, and what sort of technology you would like to see incorporated in it, or what you think Nintendo will realistically build.
I give it three years until the successor to the Wii releases, with full backwards-compatibility and the same basic name (something like "Super Wii" or "Wii 2").
Same basic design, same size. Possibly even fitting with current Wii stands.
Same CPU type with whatever clock bumps the process advancements allow (+50%?). Dual-core if we're really lucky.
Single-chip Hollywood with all the SRAM on die. Memory on the same package (MCM), 64 bit bus, two chips for what, 256 or 512MB "system" memory instead of Wii's (Ouuur?) 64MB. Unless something drastic happens and a different memory type becomes an attractive commodity, this will be GDDR4. No idea about the feature set of the graphics, though some forced AA+AF, for GC and Wii games at least, would be super-nice, and overall Radeon 9700-level features should be the goal now.
Rationale:
The Wii is Nintendo's ultimate platform format and they will want to hold on to it.
They finally have full convergence of all their back-catalog games and even those from old competitors in one device. The machine is as small as it can realistically get with DVD(-sized) media. It's online, ready to switch over to digital distribution eventually. It attaches to any TV. It can use flexible controllers ("classic", Gamecube, Wiimote+Nunchuck now cover pretty much all bases and don't forget that the Wiimote has a port for attachments which can be cheap/low-risk, because they don't need their own wireless transceiver).
In short the Wii covers all functionality Nintendo could want from a games console in one neat physical device. The next step is not reinvention nor extension but refinement.
Enter the DSlite. That thing didn't improve processing performance
at all and still sold like crazy. What's different about the home consoles now and in the near future is that HDTVs are replacing SDTVs (and those stupid 1080i-only "HDTV" widescreen CRT SDTVs). Nintendo home consoles need to ride that wave too at some point, and three years from now would be prudent timing.
"Console life-cycles are five years" isn't an absolute truth. There are/have been reasons for that cycle time but they don't apply necessarily to every games console, and AFAICS they don't apply to the Wii. If you have
perfect backwards-compat and position yourself to repeat it in a following generation, there's no need to maximize the time developers can spend "getting to grips" with a machine. Developers with Gamecube experience can hit the ground running on the Wii. This is one of the very few inherent strengths of the Wii base hardware. Chances are, developers with no Gamecube experience who start Wii development in the near future will hit the ground running when Wii's successor launches.