At this time, we basically have 4 main genres of innovation coming from altcoins:
1. Anonymity/Privacy (Monero, Zcash, ...)
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And #1 (by itself) is not a mass adoption market.
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#1 is an optional feature to add.
The key problem seems to be to be how you quietly convert the crypto to real-world goods.
For example, you want to buy a ranch in Peru.
You pay the owner in crypto-currency anonymously, then you and the owner conduct a separate transaction in fiat for a much smaller amount.
So the visible portion of your wealth remains in fiat, but it is only an facade for the real financial transaction which occurred anonymously in crypto-currency.
The fly in this ointment is that ironclad anonymity against the national security agencies is very dubious. How can you control when the person you bought the ranch from screws up his anonymity and TPTB rubber hose him to force him to reveal the crypto-currency was obtained from you.
Instead I suggest a plausible different strategy. You treat your crypto-currency as ongoing anonymous investment. You move it around anonymously so it grows gains. From time-to-time, one of the companies you invested in, hires you and converts some crypto-currency to fiat to pay you. You use this fiat to buy real goods.
The above strategy can be used with the use of a tax haven that doesn't require you to report your crypto-currency holdings/gains, so that the above is not illegal.