Good enough has been Craigslist biggest strength. You sure can innovate your self out of a good product, It does not always mean improvement. Disruption..I don't think so, competition yes. I'm pretty sure the use of disruption is getting diluted...... For the website It's not getting worse, that's a decent accomplishment for a website that's been around for such a long time.

When Craigslist is dead and gone, then I think we can have a informed decision about Craigslist disrupted status.(Wait! Just checked.....still lots of postings)