>> Christopher Allan Webber:

I heard an interview with Moore where he flatly denied this, and said that what became Moore's Law was an internal estimate that this would occur for the next $X years... it wasn't intended to be for forever, and he was surprised at how long it lasted.”

I think it surprised everyone lasting as long as it did.

but guessing around the end of the 90s they might have hit some kind of wavelength of something related limit

just a guess