Here’s my reasoning, and this is a question more than a statement.
Eth is valuable because it acts as a gas to power the transactions on the network. Sharding would enable the Ethereum network to process more transactions in parallel which will reduce the demand for gas per transaction because with sharding, there would be more capacity for transactions to be processed. This will lead to a reduction in the average gas price needed to get a transaction included in a block. So less demand (because you don’t need as much gas per transation) means lower value per ethereum coin lower value = lower price. Help me understand why I’m wrong (the internet has never had a problem doing that).