Current economy aside, which altcoins fit this description?

[tsvekric]

With the current state of bitcoin because basically unusable as a real currency, which altcoins (could) fit these criteria?

-scalable, continued usability and experience if the economy becomes massive (billions in market cap/transactions) - unlikely to have pending transaction backlog
-low friction transactions: continued low transaction fees regardless of price
-micro-transactions feasible regardless of price
-little to no useless coins due to complexity of transaction causing transaction fees to be greater than the value held, regardless of price
-environmentally/economically friendly for whatever mechanism generates coins (low energy usage) - maybe no 'proof of work' currencies.

Basically, if I want to tell customers to use a currency to buy a $1 cup of coffee that they can continue to use for that purpose in perpetuity, what currency should they use? Because it certainly isn't Bitcoin, and potentially wouldn't be any forks of it either

This is all regardless of current popularity/development of a coin - just which ones could fit that criteria should they become as popular as Bitcoin is now.

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[kahc]

The only coin I can think of that fits you descriptions right now would be https://tether.to
1 tether will aways equal 1$.

But I don't think tether will be widely accepted in the coming years.
I say give it 4-7 years and it will be ripe for the worldwide market.