Hello trackerone here,
They will not fix it because DRW was bugged in retail, it has numerous of problems from the start. Blood got gutted on toc patch with heart strike and rune weapon nerf + the need of using glyph for drw. The damage of rune weapon was never fixed. Also the 50% reduced damage doesn't propably mean 50% of damage. The scaling of drw seems to be fixed in cata however I couldnt't find any information of it. Im linking 2 retail videos to proof it. Actually on warmane drw is doing more damage than it was on retail with strike and less with autoattacks. However we can see in cata strikes scaling is fixed and drw actually hits big numbers with death strike.
https://youtu.be/1e1cL65J87Q?t=163
Cataclysm, patch 4.3.4 in video the guy used rune weapon many times, you can see his attack power on the ui.
https://www.warcraftmovies.com/movie...Xca5A6mh0my-7Q
Wotlk retail video, you can see the damage difference. The autoaottacks seems really powerful (but well faerie fire+ sunder armor+ debuffs+ maybe a shattering throw) but the strikes seems to have no scale while cata rune weapon seems to scale with everything.
In short we need to wait for wrath beta and just discuss it with blizzard, but I doesn't think they will care about it sadly.