It's not an irrational fear, but the frightening bit depends on whether or not this actually takes off. I very much doubt it ever will. The browser ecosystem, despite being in desperate need of upheaval, is largely resiliant to it because things that work don't tend to get replaced unless they are broken to a point where even the most basic of users are inconvenienced. Or forced to change (due to vendor pressure). Oh, there's the rational fear.
It's not an irrational fear, but the frightening bit depends on whether or not this actually takes off. I very much doubt it ever will. The browser ecosystem, despite being in desperate need of upheaval, is largely resiliant to it because things that work don't tend to get replaced unless they are broken to a point where even the most basic of users are inconvenienced. Or forced to change (due to vendor pressure). Oh, there's the rational fear.