The crux of this entire issue is a company known as Dark Matter, which is essentially a UAE state sponsored company, potentially getting a root CA trusted by Mozilla.
It's highly suspected that Dark Matter is working on behalf of the UAE to get a root trusted certificate in order to spy on encrypted traffic at their will. Everyone involved in this decision is at least suspect of this if not actively seeking a way to thwart Dark Matter.
Mozilla threw the book at them by giving them this technical hurdle about their 63-bit generated serial numbers - which turned out to be something that a lot of other (far more reputable) vendors also happened to have this issue.
Should it get fixed? Ya, absolutely.
Is it nearly as big of a deal as giving a company like Dark Matter, who works on behalf of the UAE, the ability to decrypt HTTPS communication? Not even close - this is far more scarier, and much more of a security threat to you and me. It's pretty disappointing that this is the story that arstechnica runs with instead of the far more critical one.
The measure of what makes a trustworthy CA are things like organizational competency and technical procedures. These are things that state level actors easily succeed in. There is no real measure in place for motives and morals for state level actors. That should be the terrifying part of this story - anyone arguing about the entropy of 63 or 64 bit is simply missing the forest for the trees in this argument.