Making her reliant on double proccing to achieve burst is a better solution. That would require more setup time and planning to achieve maximum damage output. Less damage on upfront burst Q -> R, but more damage with planning via double proccing. Though, there is a side effect: Her laning is generally unchanged/gets compensated for the less upfront damage, and less upfront damage affects her teamfighting power.
It is interesting. It would make her strengths/weaknesses more apparent and clear to the opponents, allowing better counterplay. On the other hand, it may make her more binary, her being strong in laning, but rubbish in teamfights. I don't know, interesting nonetheless.
Her shroud already got nerfed in 3.5, the re-stealth duration, no free escape bug, etc. And no free resistances anymore as well. Stealth talk is generally shyed away from since League of Legends has a binary stealth system, so any stealth changes are most likely going to be large scale and will not only happen to Akali alone. Let alone, true sight counters her shroud so hard, so the skill has to powerful enough when it is not countered.