The only other barriers are technology, regulation and politics. The average end user has zero input into any of those areas. Unless the average end user feels comfortable with BTC it will die a death. Period. But I'll eagerly await your inspired insights.
So Bitcoin will die from being too valuable. Has that ever happened to anything ever in the history of mankind.
If less people adopted Bitcoin wouldn't the price go down? If the price goes down wouldn't Bitcoin be less valuable and thus solve the problem of dying from being too valuable?
The idea that something can both be excessively valuable and die is ... well silly. Lots of things could kill Bitcoin, it being too valuable isn't one of them.