So, a half-dozen crews ran into issues by rushing themselves when trying to make up time. Let's say that in actual fact there were 100. This means there were tens of thousands of RYR flights during that same time frame when the crew didn't get into such trouble. Crews from other airlines that have done 90 minute turns have got themselves into trouble when rushing as well. So where would your new regulation draw the line? What's the safety margin?
By your asertion, CAAs should write a regulation that requires pilots to never accept an approach unless there is an absolute certainty that they will never, ever have to go around. Fatal accidents have occurred during badly executed go-arounds, so shouldn't we strive to ban them too?
New regulations are not the answer. We already have thousands of regulations, yet accidents still occur. If rule making were truly the answer, we'd only need one - don't crash. Fostering a positive safety culture has a much better chance of success. That is the message that should be taken from this story - people are raising questions about the safety culture. I would much rather see the regulators focussed on addressing that aspect.