My main question is what happens if thse 2 main crypros conflict each other?
NO
If Bitcoin and Ethereum conflict with each other, this could lead to a split in the blockchain community and affect the value of both coins. However, this conflict is unclear and difficult to play out because both coins have different purposes and uses, possess distinct properties, and are built on different platforms.
Perhaps you should pay attention to some information that some people have mentioned about BTC.D, understand simply the dispersion of money flows into the market, like you pouring water into its funnel will gradually flow down to the bottom, and the top altcoin> shitcoin altcoin will gradually be pushed in price until the water ( money) runs out.
Back in time, there is only one crypto and that is Bitcoin but after the creation of altcoins, I think some Bitcoin supporters have transferred to it. Some are still into Bitcoin but they are now diversifying their funds in altcoins. This have affected the value of Bitcoin but it's not alarming since we see that Bitcoins price can still pump heavily. Altcoins still has their own contribution to Bitcoin and to the crypto industry.
If BTC is in bull run, people will just sell and some of the profits that they will get can be use in ETH because it is dumping. ETH supporters doesn't need to worry because ETH can catch up. BTC is only leading the way like on the past bull runs that we have.