Reality tells otherwise. Businesses have been accepting Bitcoin for a while now, while new companies are adding Bitcoin (e.g. Square, LINE recently).

Litecoin and other altcoins are marginally "faster" than Bitcoin, but they do not scale for mass adoption as well. 2nd layer will accomplish this and Bitcoin is leading again, LN is live already (although still test phase).

If Bitcoin was pegged to the Dollar it wouldn't be Bitcoin, but a trusted, centralized, permissioned system.

Insanity is relative, Federal Reserve balance sheet of the "stable" Dollar has increased fourfold over the last years. Other major central banks did the same. This is unprecedented in history of central banks. Take that into perspective.