Well, it's look likes a fomo to me because it'll vanish just like other trends when more public will attract into Defi and get low reward as it's the main point for all the newcomers who get interest into defi. Also i see many of the well reputed Top crypto projects are shifting to Defi catagory. Recently, Tomochain get the Defi tag on CMC and all people get in fomo and buy tomo.As a result, tomo get an instant pump. But the major coins won't be effected , imo.
The idea cant be sustain for a very long time time, creating scarcity by reward to increase price but when the time of sale comes the rate of price dump will also be very massive. FOMO is always making money for some side of the market and everyone is trying to be part of it, especially the top exchanges, Listing those coin with very short notice.
They may be their time to shine but I still believe that if the coin has good foundation, strong dev team and actual use case in the market, they can still have good performance in the market.
So it doesn't matter if your DeFi project or not, as long as you have continuous development in your network, you have the chance to survive.
For sure, a lot of crap DeFi projects will be launched in the coming days. And it is up to the user, how he will identify those that are really worthwhile projects.