Few altcoins will halve this year as well, especially Bitcoin forks, as for Ethereum is a new thing switching from Proof of work to Proof of Stake but I don't expect a huge price growth just because of the POS implementation, ETH will still depend on Bitcoin
The fact that Ethereum depends on Bitcoin to succeed, tell us that every 4 years of Bitcoin's halving will be the most prominent ones for the ETH blockchain. The BTC halving coupled with ETH's switch from PoW to PoS could make this year (2020) one of the biggest ones for the world's second-largest cryptocurrency by market cap. But no one knows for sure what will happen next, since crypto behaves in strange and bizarre ways.
If the ETH dev team decides to delay the PoS upgrade again, we might have to wait another year (or a few more years from now) in order to see ETH gain traction within the mainstream world. As long as ETH remains as is, people will have no motivation to buy it. The ETH blockchain needs to scale if it wants to provide real use cases for the mainstream world. After all, smart contracts cannot work as intended with limited transaction capacity of the main chain. With an upgraded version of the Ethereum blockchain, smart contract's performance will rise at an unprecedented rate. Only then, people will gain the "FOMO" sentiment buying as much ETH as they can. As a result, companies and businesses will join the "ETH train" in order to boost the adoption of ETH worldwide.
An additional factor in increasing the demand for ETH will be that in order to create a validator (which should be a lot in the system), 32 ETH will need to be locked. As I understand it, from the news announcements issued by the ETH team, the number of validators will be huge.
Yes. But even so, people will be able to stake ETH using staking pools. 32 ETH will only be accessible to big whales and players in the industry. I've seen an announcement somewhere across the web by Vitalik that the 32 ETH requirement will be lowered over time once "Sharding" is implemented at full scale within the ETH blockchain. If that's so, it'll become much easier for anyone to participate in ETH's consensus for greater decentralization of the world's second-largest cryptocurrency by market cap. It's no secret that the PoS upgrade will encourage people to hoard more ETH than they'll ever spend. If implemented this year, you could expect prices to rise at an unprecedented rate.