I happen to be undecided on the the whole BTC will die one day. Reason being I think its more likely to evolve and become better.
Name recognition is important, most people don't know a lick about cryptocurrencies but they've heard about Bitcoin and that has intrinsic value.
One of the things we need to move past however is this whole reverence of white papers. The regressive idea of "no we can't do that, the white paper says" could be the main reason why projects won't make it, when its time to weed out the weak ones.
White papers are not constitutions and even those have amendments.
So, I will half way agree with you. BTC as it stands today is not ready to go mainstream, but this does not mean BTC won't adapt either.
There's a possibility of that. I've always had a feeling Bitcoin will be a relic. Call it women's intuition. It seems to me that in the quickly evolving world of technology the first token will be quickly surpassed. It seems to me it served as an example but to me it's probable that another coin or many coins will be the ones that actually get used. But that is not based on research. Just based on being in the culture for a little while and intuition and a gut feeling I have I guess.