Xerath in mage update?

I think Xerath's Q W E are fine as is it is in terms of what they do but may need slight power tuning. Xerath's ultimate on the other hand is bad. Is Does Riot plan on updating his ultimate into something that is actually viable?

Let's compare Xerath's ultimate to Zigg's and GP's. Ziggs and GP have huge AoE ultimates that can be used to waveclear and teamfight efficiently. Xerath's ultimate is a minuscule version separated into 3 shots that are more reliant on the enemy walking into them rather than you hitting it accurately. As for waveclear, it's horrendous.

Now let's compare Xerath to the more recent champion, Jhin. Jhin's ultimate has 4 shots but each shot has a slow and does increasing damage for a target's missing health and the final shot is guaranteed to crit. Xerath: 3 shots, insanely hard to hit, no CC, no increasing damage.

I mean come on. Xerath shoots fcking lightning bolts but the only CC he is given is his E?

Bottom line: Xerath's ultimate needs to be updated.