I agree on those rumors that eth will dump right after the merge because many people are also going to sell for profits but that dip won't last long because there will always be buyers right after it. For me I think I won't sell till the merge and forking is done so that I can get some free fork coins which I can sell together with my eth for a better profit.
Exactly. Instead of selling all ethereum waiting for redemption is very risky. We should keep Ethereum since this merge will definitely create ETHW and the previous ethereum fork in 2016 has also created ETC after ethereum forked, we will get it for free with 1:1 ratio. It is possible that ETHW will not be able to reach the high price of ETH but I believe it will bring significant profits to those holding ETH.
Selling ETH is too risky as it is unlikely that it will be dumped afterward, it will most likely bounce and be at a higher price than it is now. It's all speculation, nothing is certain it will happen.