Help on finding a word please:

There are a lot of shops that open on trend here in Ireland - I assume this happens in many western countries. One day there will be none at all, the next there will be dozens. They all sell the same thing and usually only last a few months before becoming no-longer-trendy and closing up. Often the new thing opens where the old thing once was.

Example shops would be:

Smoothies
"Bubble tea"
Doughnuts
Olde-timey sweetshops

Is there a name for this phenomenon?