Ethereum is able to maintain its ranking mainly because of the high transaction volume on its blockchain, not because of its price. There are still many coins with higher prices than Ethereum, but they can't surpass ETH in terms of volume.
When it comes to Ethereum’s potential, it really depends—potential in what aspect? Profitability, security, or something else?
To be honest, I don't hold Ethereum because there are still many other coins that can offer more profit than Ethereum.
This is just my personal opinion.