Segwit was not in the original intent of Bitcoin.  The original intent of Bitcoin was to be a peer-to-peer electronic currency.  The original intent did not have to rely on a secondary transaction layer with exchanges and other nodes determining what is and is not a valid/good transaction.  A bigger blocksize will allow more peer-to-peer transactions, without having to rely on centralized nodes; THAT is closer to the original intent of Bitcoin.

Sure, you can argue that a 8MB blocksize will create more centralization in miners, but miners will always go to whatever blockchain that will make them more money.  It is the users, not the miners, that will determine the value of a blockchain.