"Does a cessation of Moore's law pose a threat to our economy, our technology? I would like to hear your thoughts on this subject..."

Just think, someday builting computers might become might become a govt program- that will mark the end of Moore's law.

"Another question is... do we NEED to keep getting smaller and faster??"
Only if it's cheaper.
Btw, maybe someday will use the computing power of the human brain- I don't mean we will be smarter, I mean use the brain like SETI uses home computers- at times when you aren't using it- or if you aren't normally doing much with your brain anyhow, you could sell/give some of it to the collective- say plug it in while you watch a sit-com or "Real TV" for instance.