According to Ripple's CEO, Brad Garlinghouse, the Bitcoin dominance is expected to end soon.
He loves his ripple so what can you expect to someone that is promoting his coin? this isn't new that they are going to pull down bitcoin just for their own interest.
As a result, the behaviour of investors will be permanently altered, which will lead to a devaluation of Bitcoin. Therefore, it will no longer serve as a reference to other crypto-currencies.
Permanently altered? don't generalize the number of investors that will do this, only Ripple people will do this.