Now I just gotta chime in again: Please don't state opinions as fact.
The reasons we didn't change much since cata is not because Blizzard limited themselves but because they like the design and want it to stick.
The reason it was hard to get Soul Reaper into the mix was because the shit numbers it pulled that weren't worth a possible loss of rune recharge time.
Of the 3 DK specs and 4 DK playstyles none feel the same:
Blood: DS focus, HS/BB/DnD situational, wait for the right moment to strike, easy to get screwed by RNG
Unholy: FeS/SS focus, stack diseases, manage your Menagerie, switch from Festerblight to execute at the right time, mostly unaffected by RNG (outside Festerblight setup)
2h Frost: OB Focus, few big hitters, less spam, possible to get screwed by RNG
DW Frost: HB/FS Focus, lots of button pushing and ability spam, almost unaffected by RNG
The thing about people thinking that single rune abilities don't add anything interesting to the game is mostly because you don't make it seem any more interesting to have 1 big + 1 small rune pool with no overlapping vs. 3 small rune pools with overlapping ability costs.
Your changes would basically make every spec into a simplified DW Frost. The only thing your changes open us up to is to become Monk 2.0 "DW Frost Version" now with plate armor, separate energy bars for dps and utility and a finer chi counter.
A simplified version of something is what most people see as "dumbed down".