I understand your concern because i use to have the same concerns about Hive and other tokens that have unlimited supply years ago. However, i was completely wrong as i saw projects such as Hive Skyrocket to 4 dollars per coin.
Remember that tokens and coins that have an unlimited supply mechanism do have a limited circulating supply. Although it does grow, there are token burn mechanisms and buybacks ect which SME will put in place. The SME circulating supply is about 5 billion which is not really that large at all. Phillip can give you more details on SME tokenomics. It is not as bad as you think. SME has a very similar system to Hive as far as tokenomics and we know that Hive works.
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