XRP has a history of trying hard to get the price high (to say it nice). There used to be plenty of news on real or imagined partnerships with reputable huge companies or banks, just to drive the price up.
This will probably happen again as soon as some more money goes into altcoin market, but this should not be a real threat to ETH.
The real threat to ETH may be.. itself. Lately the politics/direction and some not-so-well-handled fork/upgrade attempts made ETH look like "just another altcoin", not really a good business platform. But that's my feeling.
Also, in another ETH related speculation thread, somebody wrote it very good:
With crypto who knows, ETH could dump to nothing based on Vitalik sneezing.
So I think that there's bigger chance ETH to fall from #2 than XRP to rise to #2, although the result is the same, I know. Just then I won't really call it "dislodge".
I like the analogy about ETH possibly failing and falling from #2 to #3 rather than XRP rising and dislodging it, thank you.
One of things that has held XRP back has been the number of XRP being released on the open market every so often. Though fintech industry analysts and users appreciated Ripple they seem confused by the number of XRP being released every year. That confused or hesitant point of view is a valid one because it seems any crypto would struggle with price increases if they were in the same situation but long term will XRP price rise to all time high againregardless of what is happening with Ethereum? I am not sure right now.