The future is now imo. Why the need to see btc or eth still existing in 2030? Is it because of fear? Blockchain and crypto will keep evolving and growing. Maybe btc or/and eth will survice the next 3, 5, 10 or even 20 years, but at some point there may be a better solution, maybe still named btc or eth, but there's also a chance btc/eth were just frontrunners and the real tech and real adoption still has to be launched or even invented. Blockchain as a base layer is here to stay though 
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Now would give more reasons for me to invest in something yet I am only waiting for the ICOVO coin to get on an exchange so i could get it.. If they were the only coins that I can choose from then I would select Bitcoin as crypto's future because it's the original coin.