If you think that the cost, reliability and the user experience does not influence adoption, then I think that you are fundamentally wrong. Bitcoin can be out competed, if we do not increase the blocksize that is exactly what I think would happen.
Of course the cost, reliability and user experience do not affect adoption. Many people come to bitcoin just to contribute resource, not asking for service, because this is a trustworthy monetary system. Being service minded are typically cheap mindset from entrepreneurs
The fact is that people in bitcoin community (mostly libertarian type) will never listen to someone else unless they see it with their own eyes. And even if they face a problem, they will tends to use their own solution instead of others, there are many ways to solve a problem without touch the bitcoin protocol
Here is another thread showing that this kind of discussion is just fruitless
https://www.reddit.com/r/Bitcoin/comments/3yyvmp/they_think_satoshi_was_wrong/