This is the reality.
BTC Miners => 4 Mining Pool operators = security is dependent on 4 guys with over 51% attack vector.

your non-mining nodes do nothing to secure the network.
Just so I've got this straight, you want to present the simultaneous argument that Bitcoin is centralised due to a limited number of miners and also that a distributed network of non-mining nodes don't help at all with securing the network? Is that correct?
Bitcoin is centralized due to the Mining Nodes decisions to Pool over 51% to only a few pools.
The problem is the LIMITED Number of Pools, not the number of mining nodes.
As if their were no pooling, then a mere 4 guys would not control bitcoin.
Remove pooling and that issue is solved.
Sad, your IQ is so low that had to be explained to you.Yes your non-mining nodes are as useless as you are in a debate. 
FYI:
Miners have power because they can control the network.
Large Holders have power because they can use economic clout to sway the miners.
Idiots that run non-mining nodes, just to claim they are important, are utterly powerless. Case in point idiots that run non-mining node have been wanting to receive some compensation for years,
and they still receive $ZERO.