The defi trend will be very similar as ico bubble. The trend will continue and this trend will never die but if there will be more scammers come to create fake defi project will make the defi market will not be so loud like this time.
People will care about their money and they will not blindly investing in the any defi project again.

We can see investors have learned a lot from the ico bubble and after the ico bubble has gone and the ico trend is still exist but investors were also putting more and more standard to determine which was the legit ico.
The new standard will also be applied with the defi platforms as investors learned a lot from the past experience. Defi can exist forever and it's not just until few years later.