All modern ad networks (like ours) are completely HTTPS ready but the transition will be slow due to momentum with existing vendors.
While blocking ads will help some (and certainly some ad providers have gone way too far with their bandwidth/cpu requirements), the web is just a richer media experience than before. The mainstream does not just want text and 80-90% of the page weight ends up being images, even on that article itself. There are other advancements like HTTP/2 and modern CDNs and better image formats like FLIF that will solve this problem much more effectively without going back to a textual world.
Still don't see what any of this has to do with HTTPS encryption everywhere though...
Do you need to use their widgets in the first place is another question.
Given how long it's taking the industry to transition away from Flash I'm not holding my breath about this being fixed any time soon.