It's worth noting that even massive companies with $30M USD of funding don't run a single Bitcoin Core node

This has nothing to do with block sizes, and everything to do with Core not directly providing the services businesses actually want. 

The whole "node count is falling because of block sizes" is nothing more than conjecture presented as fact. The existence of multiple companies who could easily afford to do this but don't because they perceive it as valueless should be a wakeup call there.