My opinion:
"The Market Capitalization of Silver is currently arround $1.504 T"
https://companiesmarketcap.com/silver/marketcap/
The Market Capitalization of Apple is currently $2.12 T
https://finance.yahoo.com/quote/AAPL/
Does that mean that Apple is better metal than Silver? Or silver is worse company than Apple? No they are both completely different asset class. Is ETH flippening possible? It is. It is even possible that single ETH token will one day overtake BTC if this token will be represented by huge company (if one day ETH token will have similar legal rights as stock shares)
Does that mean that ETH (or this asset) will be better than bitcoin? No. It will be a different asset. ETH at 150 000$ and 100 GAS price will take 10k$ for transfer ... ETH will sooner or later give up on decentralization for favour of TPS. If ETH wont do that people will move to BSC or other semi-centralized chains with all devs and money (BSC is now 7x bigger than ETH in terms of TX per day) making ETH a relict of pass times. If ETH will give up on decentralization than BTC will remain a big player as one and only crypto store of value (crypto gold). Will it be the biggest player in whole crypto industry forever? Most likely not. Will ETH overtake BTC in long run (not pump and dump one day event)? It is possible but it is also possible for DOT, BNB and many more.
BTW. Isn't it a tradition of crypto bull runs that we talk about flippening in the middle of bitcoin bubble ?
I remember the same when BTC was around 3k$. We had ETH/BTC flippening FUD and BCH/BTC flippeniung FUD in 2017 as I remember correct. 
