“As bitcoin grows, so does the network and the computing power behind the scenes required to run it. The majority of bitcoiners won’t be able to support their own nodes and will be taken over by companies like KnC.”
http://www.coindesk.com/bitcoin-nodes-need/
Also:
https://nxtforum.org/general-discussion/number-of-bitcoins-full-nodes-is-decreasing-what-about-nxt/
"4.1 Small size full data nodes
you may forge them by using low-power consumption devices like smart phone,
tablet PC or pocket PC and provide full data nodes for the whole net."
Waiting with excitement!