In my opinion they should not rush according to the pressure of the community but focus on the upcoming challenges and to delay it as much as needed.
I think thats why Vitalik set the bug bounty for hackers to really find flaws and error on the new system. Some would think that he is boastful or quite confident but lets rule out that he did that to make certain that there will be no drawbacks on the technology. I think thats a good way to address concern.