It's going to be a while before they take it away. At first they wanted it quick but then once they figured out they had to replicate all the things 3rd parties do to enhance checkout they revised their date to almost a year later, lol.
To answer your question though, yes, you can still purchase shipping insurance. We can even still do it for you automatically. We already do this for sellers that do not use our checkout. We can tell if a buyer that used a sellers eBay checkout opted to purchase insurance and automatically purchase it.