People are greedy and want 2 new fork coins thats all.
Ethereum´s update will not help Ethereum to be better than EOS, we need to wait little bit longer, but how long? When Ethereum 2.0 come? Maybe next year?
The hard fork that will happen during the next days is not a contentious hard fork, so far it seems everyone is agreeing that the current hard fork is needed so the chance of two coins appearing are low, obviously this could always change but so far I see no indication that will be the case, so you are wrong on your assumption, investors are not getting ethereum to get this second coin, they are just very optimistic about the future of ethereum with this new upgrade.