Yes I don't think XRP will do anything to "crush" BTC. It's even more different and has different kind of people willing to invest in it.

But thats also the thing the people who feel threatened by it don't get. I don't really know how much it will really affect BTC, but from how things look now it's worse than before LTC took off.
I agree on gox also, although not short term, since the exactly kind of thinking process makes somebody think we "need" gox to maintain a good price, don't ask me for the rationale on this it's mainly irrational - anything changing the status quo is potential bad news for those guys.