I think that with the NME stuff, the interviews, the shows, the new album coming out and prospective 'dark' album, the site updates, and everything else that Robert and The Cure find time to do, BESIDES spending time with their loved ones, Robert might just not have quite enough time lately to get all the extra tracks and demos together, and then remaster them. I do agree that they should get done, but Robert and the crew have a lot on their plate right now.
We don't want to cause a nervous breakdown before he turns 50, and then have him go all Disintegration-era on us and dropping LSD and making one of the darkest albums ever (not that Disintegration was a bad thing, lol, we just wouldn't want him to go through it again!), right? lol
I'm sure he'll get around to it, and we'll all be happy once again until we start asking for WMS, Bloodflowers, S/t, and 4:13 remasters in another 5 or 10 years, lol!