If other blockchains dwarfed the Steem blockchain in transactions, what would remain for Steemit then (following your theory)? Isn't social media more than that? What about Steem's original vision of 'value creation'? Is that not an option anymore?

To content creators value is not purely defined by price and monetary outcome. It's also not simply about being seen or heard (buying votes doesn't satisfy us). It's about sharing a common vision with others, interact, mutually support, inspire - it's about exchanging human values.

Bots can't do that for us :-)

Transfered to a real life scenario it's as if you said:

You can join the local community of your hood where you get rewarded for providing attention. It has the best infrastructur of all communities in your country. You don't even need to go there personally to get your paycheck, you can send your clone.

Where's the real benefit?