What you fail to realize is that releasing games that work on both is the only VIABLE option that is available. There is no point in selling games for only the dsi when you can entertain both markets. The ps3 vs ps2 scenario might not work so well, but if it still had BC, as some still do, then your argument would be nothing.
Most devs make games that are not compatible for both because they want the added features of the new system that can't be supported by the older system, but it does happen occasionally. What I'm saying, and have been saying, is that the new features aren't attractive enough for this to happen.
The fact remains is that, if it were really successful, all games will be dsi based and not compatible with ds. That is, IF, the upgrades were good enough to warrant this move, because the upgrades are not compatible. This is a fundamental difference between slim version, lightscreens, or color for that matter. those upgrades are very significant but yet are not any "different".
PS: you used the words "major upgrade" to paint me as being hypocritical. I never said it was a major upgrade. I loosely implied that it was a change. Something can be different without a change in quality. Like milk is different from cheese. Neither is inherently better than the other.
