Of course, this is a hypothetical situation, and Ehtereum could scale in time to meet the needs of its institutional partners in the Enterprise Ethereum Alliance and hundreds/thousands of ICO projects and developers.
There are a lot of eyes on EOS. In my view, enterprises seeking to build private blockchains based on ethereum architecture all have infrastructure requirements, 'trusted shared ledgers' Quorum, Hyperledger, hybrid variants of Ethereum and such all share the same requirment. EOS addresses infrastructure and scaling very well.
As seen, public ethereum, doesn't perform well under load and scaling solutions under development tend to be off-chain platforms. I commented on this recently in reply to post by @officialfuzzy titled 'Porter Stansberry puts 500,000 Eyes on EOS!' the full article is an enjoyable read. https://steemit.com/@johnchamberlain/re-officialfuzzy-porter-stansberry-puts-500-000-eyes-on-eos-20171023t174215095z
EOS does have some very professional partners / team members, and they have been making their rounds with the global blockchain events...
personally, I really like the approach they're taking - growing slow and steady, rather than playing the usual ICO game of sensationalistic hype and inflated expectations.
Dan does have a track record of successful projects - and while neither Bitshares nor Steemit may have rocketed to popularity, they've been strong steps in laying a proper foundation for what EOS could become - and the players onboard EOS, such a Blockchain Capital's Brock Pierce, may be an indication of the level of professionalism the project may be ascending to.
There are reasons for optimism... :-)
I can only hope Brock Pierce doesn't have an important position/role in EOS.
Why is that?
His past might come back to haunt him one day and that might affect EOS if he has an important role in the company.
https://en.wikipedia.org/wiki/Brock_Pierce
Some in Bitcoin group resign over new board member’s link to sex abuse
You can search and watch the 'An Open Secret' documentary if you want to know and see more details about him and DEN, among other things.