I think your point is the reason to wait for Rev B of the Intel PowerBooks.
The bottom line is this:
1. Apple has mixed results on Rev A. Some work fine, but when there are problems, they can be nasty and Apple does little to nothing other than fix them in Rev B
2. Point 1 really doesn't matter here. Wait for Merom because it is the true advance, a Rev B+, of the Intel chip. Intel fell way behind and are scrambling to catch-up. They have done some great work in the past year, but it will be Merom where Intel really hits their stride.
3. Adobe and others have already said they will not have universal binaries until 2007. Others will have a Rev B. of the software by then.
So, while it will be hard to wait, I think the smart move is to wait for "Rev B." in 2007 of the Intel chips, software, and yes, the Apple hardware. 2006 is really going to be for the early adopters.
I generally think of myself as one, an early adopter, but I don't see much point honestly. Merom is where the big advances are....speed. 9+ hour battery life, etc.