Yeah, I don't know where Pachter is getting that to be honest. While he surely has some level of inside information that we don't, that train of thought seems to be very much in the vein of, "Nintendo did X poorly with Wii, so they will logically do X poorly with Wii U." As we've seen with the transition of GameCube to Wii and even GBA to DS, that isn't necessarily the case.
One of Pachter's gripes is the non-standard Wii U tablet. Sure, Wii U is going to have a "strange" controller that some cross-platform developers will shy away from, but it's not going to have nearly the amount of developers shunning it for graphics hardware reasons.
It'll be interesting to see if we get specs for Wii U/Xbox v3/PS4 at E3 this year...that way we'll be able to see how much of a visual spread there will be between the upcoming consoles, which should give us a better handle on the potential for cross-platform support.