Hello Neil. I would have left you a comment on your blog, but you've got comments turned off, so I'm posting it here instead. My original post was not a swipe at anyone (or I would have named people :-) and the one thing this blog is not devoid of is arguments about ePortfolios and PDP.
If you want to know why signing a 5 year contract with PebblePad is a bad idea, take a look at The VLE/LMS is dead. Just like Blackboard, PebblePad is also predominantly tutor/institutionally controlled - the students didn't sign the contract with PebblePad, and by doing so and mandating it's use, the University has taken away the element of choice which is so important in embedding PDP in a meaningful way.