as we know now Ripple has taken the position of Ethereum (ranked 2 in the coinmarketcap), and will this change everything in the future? My point is that Ripple replaces Ethereum whether there will be major changes in the future, such as whether all ICOs will use Ripple as a payment from their ICO to replace payments using Ethereum and all exchanges will use Ripple (XRP) as a payment to buy or sell altcoins on the exchange.
if I think that can happen and what do you think? please give your opinion.
That's not going to happen, because XRP is not Ethereum. For what is happening now is temporarily only. I know that Ripple so far was just being controlled by the whale investors. For sure when the right time Ethereum will bounce again that's the right time were Ripple will drop its price value.