Recent news is that snap chats redesign is costing it dearly. With reduced user base, fleeing advertisers and falling share prices - 50% this year. All because of a redesign.
I remember earlier digg followed the same fate. Being a 40M company to being sold at just 1% of that value, after it redesigned its site.
Even earlier there was a site which used to sell myspace themes, had huge revenues, which drastically fell to zero after a redesign.
Keeping all that in mind, I am planning to redesign habibur.com .