The price of ETH depends only on how much the user needs to pay for miners. Due to the introduction of ETH2.0 sharding, the overall TPS would increase significantly, and the transaction fee for a single transaction would be a big decline, and the price of ETH may continue to fall.
Despite i liked the analysis you made, i don't totally agree with everything.
I don't think that eth price after the set of eth2.0 will only depend on mining fees. Many other variables can infect the price and the supply in circulation as well.
We can't ignore the depandance of eth to bitcoin, like other alts too, so it's far to think ethereum would replace btc.
Better to move this topic to the altcoin board.