Nah. It's been there, done that. You might not like Masked Rider (most people don't), but it is what it is. Let's adapt something new. As far as the next adaptation goes, I'd like to see them move forward. It'll be 2009 by the time Dragon Knight airs and Ryuki aired in what? 2001? Probably best not to reach too far back.
To be honest, I'd like to see all of the post Ryuki shows adapted (even though I'm not a fan of Hibiki really, I think it's got some good stuff to work with), but above all else, I want them to further the awesomeness that appears to be Dragon Knight. Don't just adapt for the sake of adapting, but try to make it a show that we can enjoy.
The effects could be easily redone for those two ,and I like the rider designs for them. For Black ,they could be like disney and ask if they could make the next rider like Black if its possible and we could get a remake of it. I would love to see an Ultraman series remake of the 1964 version with American actors and a more serious storyline.