I'd like it if Ziggs was able to siege towers better since that's kind of his niche now (even though he sucks at it.)
Ziggs literally hasn't received a single meaningful nerf since his mini-rework.
The only thing that indirectly hit his pushing power was tower plating and even then, if he somehow manages to get a tower that low that early (be it through roaming or shoving while his laner roams) he gets a massive spike in gold due to the plating.
If you need to revert the Ulti cooldown changes I don't think it would matter that much, but I highly doubt this will even put him above a 48% winrate and will just be a nice buff/revert for him.
I doubt this is something they'd add back, Ziggs was too good at stalling his own lane (backing early and ulting to clear the enemy wave as they pushed) and roaming to side lanes to ult and save his allies' towers.
I'm not really much of a Ziggs player, but they could buff his Satchel Charge destruction %s or give him QOL buffs like mana regeneration or higher movespeed and see how that works out.