[aminok]

It doesn't follow that if there are 6500-7000 nodes now, there will be fewer with larger blocks. If larger blocks allow for a larger economy, there will also be more candidates for running full nodes. Things are different when the percentage of world population using Bitcoin increases from 0.01% to 20%. Spent tx pruning, which has not yet been implemented, can also help increase full node count. From what I've seen, projections on how the block size will affect full node count don't take this into account.

tl;dr: optimizations like pruning, combined with a much larger economy, could result in a far higher full node count under a large-block-size scenario than there is now.