In general, yeah the memecoin craze won't last at this velocity, nothing ever does. However, I do remember thinking the same thing about Dogecoin in 2014 (this meme is old already, it will never last), and I was totally wrong. Not only did it last but its flourishing now more than ever  this is largely thanks to Elon's interest but also because it has some technical merit, which other memecoins are famously devoid of.