I thought the long term value analysis of Ethereum by Pitchbook was excellent. Below are some of the points that I found to be most salient (link to the full analysis at the end of the article).

Economics

We are not entirely convinced the Medium of Exchange  (m=pq/v) theory is an appropriate representation of new and young digital economies like Ethereum, so it is possible value accumulation will be driven by different factors. However, we do believe the nature of the Ethereum economy will lead to miners capturing a much greater portion of value than token holders. This is likely driven by the shift to PoS, which dramatically lowers the cost to maintain the network, as well as leads to greater token velocity when a growing number of dapps pay more transaction fees associated with computational processes on the network.

Protocol Security

Consensus Mechanism:

Ethereum currently runs on a PoW consensus mechanism utilizing the Ethash algorithm. However, the Casper protocol is currently in testing and will introduce a hybrid PoW/PoS system to the protocol with an
end result of a complete PoS-based protocol. The protocol allows for pseudonymous privacy but not complete anonymity due to the ability to track activity across addresses.

Token Distribution

Classification: Utility Token

Purpose: Ether serves as the medium of exchange for dapp developers (i.e., end-users who pay for the computational power used by their applications). Conversely, Ether acts as the nancial incentive for miners to uphold the network because miners earn newly minted tokens and transaction fees for every group of transactions they verify and add to the blockchain.

Distribution

Supply Created During Presale: 72,000,000 Current Supply: 97,782,705 ETH*

Inflation Schedule: Capped at a maximum of 18 million new Ether per year.

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Competitive Advantages Over Other Decentralized Platforms

Ethereum’s biggest competitive advantage over other decentralized computing platforms is the enormous ecosystem built around the Ethereum network over the last three years, which continues to grow daily. Ethereum now boasts over 1,000 decentralized applications being developed on the platform and has an array of supportive real-world companies, including institutionally backed mining companies, startups and investment rms solely focused on developing the Ethereum ecosystem

Pitchbook analysis on Ethereum