Hi
Are you in England? If so, what I am going to say is quite biased. I'll tell you the factual bits first and then go on to my personal point of view.
The Westminster government is in the process of changing the special needs system. From September 2014 there won't be any new statements, they'll be called Education Health Care Plans. I have lots of information about this on my website which is called edyourself.
Children and young people who already have statements by September 2014 will be the last to be changed over to the new system.
So far so factual.
I personally believe that all other things being equal a child who qualifies for a statement would quite likely NOT qualify for a plan. Also the system for challenging aspects of the plan will be weaker (sorry, less adversarial) so the best security blanket is already to have a statement by September 2014.
Anecdotally there is a rush to get statements and a reluctance to commit to trying out the new plan (even with a promise that all the protections of the statement will still apply)
Having said that, the statement (and in future the EHC plan) might well not get you anything much in the school system anyway, more for example than you would get by having a formal diagnosis of HFA. At present a statement can be a shortcut to getting special arrangements in exams, but there are other routes to achieve this and it's a while till yours will want to do exams so it might change by then anyway, plus it's not a magic bullet because many exam centres turn down external candidates who need special arrangements.
If you decide to go ahead and get a statement you can request a statutory assessment (don't know how far you are down this path already) whether or not your child is a pupil in school, and you have the same rights to appeal as the parent of a school pupil. In other words, your child doesn't need to be in school for you to try and get a statement.