As long as ETH keep their performance above average I guess it will easily touch 20k$ - 30k$ in ten years from now, I hope the utility of ethereum keep growing and many people use it as their blockchain. But ethereum should be aware of their competitor for example BSC and TRON.
The competition is growing every year, we can't expect every changes on what will be the consequences. On the positive side about eth, the span of 10 years is enough to consider maturity stage if it's price so I would have to expect $10k achievement. If we're able to reach that stage, I think long terms holders will have the perfect time to harvest their fruits of labor.