If that is done only the domainers and some business that understand the workings of domains will take it up, the rest of real .co.uk businesses will be at the mercy of cyber squatters and security issues, for years to come.
If you were giving advise to a business that had a .co.uk would you advise them to take up the rights to the equivalent .uk?
If the answer is yes, why not let them all have it and save the millions of £'s it will take to educate them to take it up and save the UK namespace the damage of having 2 tld's serving the same purpose with all the problems that brings.
This will not be like when biz and info were introduced and people were advised to take up the equivalent in these extensions to protect their online interests ( the industry was not that stupid ). This is virtually a twin of the .co.uk you arleady own, all website owners and all owners of quality domains will take up the option.
It was reaching a point where when registering a new co.uk it may have been
prudent to register the org.uk due mainly to it's growing business use.
The .uk will become a must have for co.uk owners.