Mainly I just want the graders to stay up. I've taken 2 programming courses and having the auto-grader feedback really helps in figuring out how I'm doing assignments incorrectly.
I think the main reason why any reasonably complex grader is not allowed to run after the course has officially finalized is cost(s).
While for users it's free to take the course, the offering company probably has to pay fees to whatever IaaS they're using to run the grader(s). I would imagine to make it 'cost-effective' for their purposes, they'd be interested in as many people as possible benefiting from the grader's functionality if they're being charged by the hour for example or some other block-allocation unit.
I would suggest giving Udacity a try as well. Most of their courses do not have deadlines.
For example, here is a great course they offer on web development: https://www.udacity.com/course/cs253 , co-authored by one of the Hipmunk and Reddit creators.
