Open an RDSP now or wait until a child becomes and adult?

Because RDSP beneficiaries will probably have lower income than their families once they become adults, people think that they should wait until the beneficiary is an adult before opening.  The analysis doesn't necessarily bear this out.  Read the post:

 http://rdspresource.ca/index.php/2012/01/when-should-you-start-an-rdsp-for-your-child/