For that to happen we will also need bitcoin to be a little bit more stable because whenever bitcoin is bitcoin goes up or down mostly all altcoins suffers.

But XRP is centralized and has not the main feature of cryptocurrencies. Many people believe that XRP is not even a cryptocurrency. Also consider the Ethereum's upgrade to Ethereum 2 which will cause scalability problem to be solved. It is really difficult for XRP to overcome Ethereum.

Ethereum 2 is being expected for more than a year now, so I'll reconsider my thinking when this comes... maybe by that time XRP is also hugely improved?

As for your other argument, I don't want to open a big discussion about XRP here, it has its own thread for that.
Let me only say that we don't have any truly decentralized coin in the high market cap league; for the rich people will always have a way to become richer (see ASIC manufacturers in Bitcoin, GPU farms in Ethereum, escrowed XRP for Ripple Labs).

ETH will be the only one reliable and decentralized global computer eventually.

some stages for whole industry IMO.

first stage:
bitcoin born, and the participants mainly are tech guys and individuals.

stage two:
many fork coins,everyone(still mainly individual) forked bitcoin to earn money,but now,almost all guys realized only bitcoin have real value and network effect.
So is the market,big money and institutional investor almost rushed into bitcoin.

stage three:
Ethereum born with fully new technical extension of bitcoin.

stage four:
as you seen,many forked platforms emerged with so called smartcontract to replace or surpass ETH.
But now,not individual，rather than many famous VC have created forks of ETH smartcontract,they are just scammers.

stage five:
You have guessed,all these forks will disappear gradually or become scam projects.
Ethereum is becoming the only one reliable decentralized global computer and smartcontract platform.

stage 6:
Assumption that new project born with fully new technical extension of Ethereum...

Yeah like ethereum working on network speed, they will have to improve ethereum in future because latest tech will compete with ethereum.
Agree with you ethereum can't remain reliable but can win the competition and try to remain reliable & good. 

It is obviously true, Tether is better over at the Ethereum network for faster transfer times. While Dash, many Venezuelan businesses have been accepting Dash for the last 2 years but according to some, buyers would rather use bolivares or US dollars.

There are many fastest crypto's but ethereum still the best as you say above that's why ethereum still standing as world 2nd best cryptocurrency/real money! Ethereum going down because 1 step back 2 steps forward and we will see big rise very soon, Vitalik cooking something behind the scene! 

It big anticipation about ETH2.0 let's see what solution the team will bring everyone is looking excited and have big   expectation it will resolve the scalability problem from this network suffering at the moment no doubt Vatlik is genius person surely he have interesting plan about that.

this ethereum-scalability is way overdue and the hype is already done, the smart contracts hype is done, the ico hype is done.
the next phase of crypto now is dapps. as we can see eos dapps now way more advanced than ethereum dapps and network.
https://dappradar.com/rankings/protocol/eos/
the scammers are creating more legit dapp now, instead of creating endless scam ico, people are now creating working dapp which is legit and the income keep flowing in.
more and more blockchains now are focus on dapp platform.

oh, the chinese already way ahead in dapps.