I emailed via the website contact form last night. Said how much I'd liked the service, and encouraged others to use it, used it on all my trips this year and was planning on using it again in December and asked if it would still be running then.
Got this in reply:
Thank you for contacting the Walt Disney World® Resort.
We are so excited to hear how much you enjoy it!
We have not heard of it being stopped at any point at this time. It has been really well received, and hopefully it will not be ended anytime soon.
If you have questions or need further assistance, feel free to contact us.
Sincerely,
Justine Worthington
eCommerce Sales and Service Team