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Your sentiment and your plan do not align. Ethereum is so far head and shoulders above other cryptos in the "coolness" factor that it's unreal. Do you realize how many popular tokens are ERC20 tokens?
Yes, that's why I bought it! But it's still proof-of-work-based. The future is proof-of-state. I know folks are trying to retro PoS into Ethereum, but I'll believe it when I see it. Many others are already there. I'd say: Bitcoin is first gen, Ethereum is second gen, and there are a variety of third-gen coins with good UX and proof-of-stake already on the market. I expect one (and probably only one) of these latter t…
Gas prices? A standard transaction that will confirm in ETH isn't accepted in as many places because people are building DApps and ERC20 tokens, which are what you transact with on these services. But in order to get these tokens, you need ETH. That being said, ETH is getting wider and wider transactional attention. Coinmarketcap even lists all other alts wrt to ETH now (in addition to BTC). Most big exchanges now have many ETH/ALT pairs.