We see a huge concentration in mining environment 4-5 hands control 75%+ of mining power (Pools and Large Ops)
If the Blocksize increase exponentially the numbers or nodes may drop in a significant way just because they require to much disk, actually the network increase but there are not so many full nodes (nodes sharing the blocks)
The dominance of large mining pools is not due to the cost of running a node. There are thousands of full nodes, and yet the top 4-5 pools direct the majority of the network hashrate, as you note. The reason large pools have high hashrates is that pool size reduces the payout variance to miners, so miners prefer to use large pools.
So you need to be clear what you're trying to solve, and what is the cause of the problem. Because keeping the block size at 1 MB forever is not going to reduce the dominance of mining pools.
