Why the hurry?
Overall I agree with you, fools rush in, etc.
But, since you asked…
1) There are lots of people who are very worried about their future. For example: my friend with a German wife, they’re both worried. My Mexican friend with his polish wife, the deafening silence from No10 is forcing them all to consider how they’ll leave the uk when they’re told to. It’s easy for people like me to think they’re worrying over nothing, but who knows what our new pm (‘immigrants go home’) has in mind.
2) Eu funding for uk science is going to start drying up, this is bad news. The longer we do nothing about it, the worse it’ll be. if we’re to have a future in high value manufacturing ( aerospace, medicine, energy generation, etc.) we need to start nailing down the access/collaboration/funding agreements.
Our relationship with the EU is already changing. We need to get involved with the process, but we won’t be allowed in the room till we confirm our position.