$100 fee is really high, it's way bigger than Ethereum's network fee, so what's the reason for that? Must be because of some specific DeFi mechanisms, right? But regardless, some people would still be using DeFi right now, if they put thousands of dollars, and expect quick returns, $100 isn't a big fee for them. Also, there's no adoption of DeFi in real world anyway, right now it's just a toy for crypto enthusiast to make high risk investments. No one in real life is putting their money into DeFi instead of traditional funds.
Agree. Fees have been extremely high a couple of weeks ago. Luckily, there has been a reduction in network activity, resulting in reduced fees. I can now withdraw my DAI from Compound for only $20 (in USD). It's still a bit high, but affordable to pay for the average person participating in "De-Fi" platforms. ETH needs to scale urgently in order to maintain adoption of such platforms in the mainstream world. Otherwise, people wouldn't want to use "De-Fi" on top of traditional banking. With high fees, making profit through lending becomes widely unfeasible. With ETH's current situation, developers might migrate to alternative smart contract platforms like Tron and EOS. After all, these contenders of the ETH blockchain are extremely fast and dirt cheap to use for daily payments. Using "De-Fi" platforms on these blockchain networks becomes feasible. But somehow, developers have stayed on the Ethereum blockchain after all these years. I guess that decentralization goes above high fees and slow transaction confirmation times.
Nonetheless, time will tell us if "De-Fi" will be able to live up to the task with high fees on the Blockchain. No one serious enough about their money will use "De-Fi" on top of traditional banking. It's more experimental grounds than anything else. Unless scaling issues are fixed, I don't see this going anywhere. "De-Fi" may turn out to be an idea that will slowly fade into oblivion. Just my opinion