The pure speculators I know invest in smaller cap cryptocurrencies to maximize their gains. The only people I know invested in bitcoin are in because they believe in its long term value.
Anyway at this point you're trying to predict the future and I'm sharing anecdotes so we're not getting anywhere, let's tackle your main point:
> The lack of arguments against on chain scaling, backed by actual research, is what's lacking.
The value of full nodes is widely understood by bitcoin contributors [0][1][2]. Increasing the block size directly increases the amount of resources required to run a full node. Increased bandwidth requirements is especially a problem.
It is up to the candidate (s2x), not the incumbent (core) to show that no, it won't be harder to run full nodes, or to show that you can have just as much security by running an SPV node. Because the candidate has failed to back up their proposal with evidence that security is not harmed, the proposal cannot be allowed to move forward. Makes sense?
[0] https://www.reddit.com/r/BitcoinBeginners/comments/3eq3y7/fu...
[1] https://medium.com/@morcos/no2x-full-nodes-889c20100a8d
[2] https://en.bitcoin.it/wiki/Full_node