I'm pretty positive Wii will no fade, but I also see that once PS3 and 360 break the price barrier (no need to sell at 100 even if Wii can possibly reach that point, but just below 300, ideally 200) market share will change. Who will be stronger then? I don't know.
PS3 has superior hardware and provided 3rd parties don't leave, the richest/most varied future catalog. BUT, if the brutal anti-sony campaign that most media are feeding keeps on projecting such a powerful shadow over PS3 future and doesn't slow down, then I see PS3 following the fate of the Concorde. To avoid being so dramatic, a simillar situation as with the Atari ST and the Amiga could happen: the second one was a much better value, but it costed more, and most games were done in the inferior platform (ST) and the ported to Amiga.
From the Wikipedia (it makes me sad to remember this happened and angry seeing it can happen again):
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From the Amiga's introduction in late 1985 , through to the early 1990s, Amiga games were developed in parallel with the Atari ST as both machines utilized the Motorola 68000 CPU. The Atari ST was, by default the industry's primary focus for 16-bit games development because it initially had a larger user base than the Amiga. Additionally, developers found it easier to develop for, and it was easier to port from ST to Amiga than the other way. This was due in part to the ST's minimalist hardware design, which consisted of the 68000 CPU which controlled a bitmapped framebuffer chip called Shifter. The ST's graphics hardware was similar to previous computers, such as the Apple II or ZX Spectrum, which made the transition to 16-bit easier. In contrast, the Amiga uses 2 chips to form it's graphics hardware, making it a more complex architecture than previous generation of computers. This made programming the Amiga a harder task in comparison to the conventional design of the ST.[citation needed]
A major proportion of games developed from 1985 to 1988 were written specifically for ST, then converted to the Amiga. As a result, many Amiga games of this period were, in most cases, identical to the ST version. These games were usually called "straight ports" and did not utilize Amiga specific features, such as the blitter and hardware sprites (useful for animations), copper (useful for raster effects) and superior color capabilities (the Amiga has larger color palette and can display more colors at the same time). Additionally, games that did not make use of the Amiga's hardware often ran slower on the Amiga because the ST's CPU was clocked slightly higher at 8 MHz verses the Amiga's 7.09 MHz. This went against the Amiga's design philosophy of using hardware acceleration to reduce the load on the CPU. The only major difference in these games were apparent in audio effects and in-game music. The Amiga used digitally sampled audio for realistic sound and music, while ST used a Programmable Sound Generator, which were used in older 8-bit computers.
Ported games were perhaps an unfortunate development for the Amiga. Games ported from the ST were often superior on the ST, which made the Amiga look worse if one used those games to compare the systems. This and the Amiga's higher price contributed to the Atari ST gaining more market share.
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The similarity to this gen situation is scary. It also helped atari the spread rumour that Amigas crashed and had "viruses". Both did, but it boosted Atari sales at the beggining.