That's a question I don't think many could answer. My answer would have to be "more" the further down the track the more the price will go up. Not without its falls here and there but the answer will always be more especially while the dev team keeps up their amazing work.
But the answer is always more in 2020 it will be more than it is today, in 2023 it will be more than in 2020 and in 2030 it will be more than in 2023.
Anyway thought I'd make this quick rant to all those who keep asking me if ETH is to expensive to invest. If you're looking for short term gains and only have a small amount of capital then yes. If you can go long and I'm talking 1-3 years then yes.
When I started bitcoin was $5usd when it got to $178 I still remember investing, all the way up until it was over $1000 then when it fell back to $200-300 I went hard buying as much as I could. The same now for ETH still a shitload of room to expand. So if you want to get rich keep investing, if you're not good with math get good with research and know everything that's happening.
One day I will set a date on here for some destination to catch up with everyone for a drink who took a shot with their finances and wanted to get rich.