The old system would not have changed that. I'm still having nightmare of Winter's chill during Wotlk. The old dispel system doesn't promote best players, it promoted lucky players. Because for 2 identical situations, if you dispel the right thing with the first dispel (compared to 4 try for the second), it's not because you are better.
What is the real problem? Spamable (or short CD) cc? Or 8 second dispel? For me : spamable cc.
Offensive dispel should have a CD too.