As if said before “ my suggestion make Void Form a 2-3 min cooldown last 30 seconds like many other classes with dps cooldowns, it enhances the skills and dps as normal and make the void eruption effect perhaps spread Shadow Word: Pain to all hit targets. Great help for M+ and AoE situations.
While also giving back the Shadow Orb style people love for a normal play style, spending orbs while in Void Form hit harder.
This gives us the best of both worlds, finally a strong dps burst cooldown, the Orb play style and the awesome visuals of exploding into Void Form.
It’s a small change, gives Shadow much needed help within the Mythic+ content which seems to the staple now in WoW… ramp specs are horrible to play when it’s all about rush-rush timed content.
Also throw in a glyph to make PW:S visually look shadow/Void. 
This way nothing gets scrapped, just enhanced, I’d love a on the use button like Mages Combust, Warlocks Dark Soul, DKs army and Shamans Ascendant just to name a few to help boost my damage when needed and defiently help in M+ AoE situations.”
My 2 cents , I’m all for Void Form, just as a burst cooldown. Visually it’s awesome would be a shame to lose it. Just needs to be adjusted into something more practical.