Imho, Ethereum is forced to completely switch to PoS in order to increase people's hoarding and speculative demands. And that will boost its value. But as far as I know, switching to PoS completely is something that takes a lot of time to complete.
The Ethereum development team always wants everything to be safe, so it needs to take more time than usual. I guess we have to wait until 2021 to see that.
Agree. The PoS design will greatly increase demand for ETH, resulting in higher prices over time. If successfully implemented this year, I believe that ETH will finally reach a price of $500 per coin. But if the team keeps delaying the upgrade, prices will stall across the market. Many people are desperate to see something big happen with Ethereum by 2020. With Bitcoin's halving event in May, the pioneer cryptocurrency's rise in price could positively impact Ethereum and other cryptocurrencies on the market. It's no secret that Ethereum rises according to Bitcoin's success in the mainstream world.
Of course, ETH devs want the safest path for scaling the second-largest Blockchain network in the world. But its competitors (EOS and TRON) are already in the lead with faster block times and cheaper transactions (no fees) than Ethereum. The longer the dev team takes in upgrading ETH to PoS, the worse it'll be for its survival in the mainstream world. Other alternatives can rise in mainstream adoption with their current design which is scalable and efficient for decentralized applications. They could take a large portion of Ethereum's market share, as most people prefer convenience over censorship-resistance. I hope that I'm wrong, and this year would turn out to become the biggest one for ETH yet. While I don't mind waiting for another year or two, the gap in time will allow ETH competitors to become bigger and stronger than ever.
Nonetheless, if 2020 turns out to become ETH's biggest year yet, many early adopters will benefit of the high prices on the market. We're still early as ETH hasn't adopted PoS. As long as prices remain below the $200 - $300 range, you'll be able to buy some coins to sell them once Ethereum becomes a full-fledged PoS cryptocurrency for the mainstream world. In effect, it'll be a win-win situation for both the ETH "hodler" and the platform itself. Just my opinion :)el