Everytime I buy a card, it's always obsolete after I buy it. Buzzwole hasn't even been out that long which sucks because I wanted to use it. What else is there that plays aggressive like it? Ho-Oh?
I think part of the problem with Buzzwole-GX is that it's thriving in a meta where Zoroark-GX is VERY prevalent and it can overpower it. Now we have more players picking up Malamar / Necrozma-GX/Ultra Necrozma-GX that is capable of tangling against Buzzwole and winning. Then throw in the rotation where everything, including Buzzwole-GX, slows down.
I think that the big reason why Buzzwole-GX gets played is because it takes out Zoroark-GX decks efficiently. Sure, Bench damage from Jet Punch is nice, but we are about to enter a format where if you're not OHKOing threats, you're getting OHKO'd yourself (VikaBulu and Malamar / Ultra Necrozma-GX decks, specifically). I have no doubt that Zoroark-GX decks will get played post-rotation, but they won't be top tier. And I think we'll see a direct correlation of Buzzwole-GX being played less often because to this.
What else is there that plays aggressive like it? Ho-Oh?
The problem at the moment is that there aren't a whole lot of people discussing the future meta. Just we few. We more than likely won't start seeing momentum on this until AT LEAST the US Internats tournament is finished. And even then, we still have well over two and a half months where we are currently standing before the next set becomes corporeal. A LOT of meta shifting can happen within that time frame. But at the same time, any decks that are being built for Worlds format should be taken with a grain of salt.
That said, if you really sit down and look at the cards available from SUM-on (including Celestial Storm), as well as look at what popular decks are available now and what they all lose (or don't lose) to the rotation, you will be surprised at what you find. Some of it is obvious, others not so much. But Ho-oh-GX, as you mentioned, is a good start.
I will say. VikaBulu loses next to nothing to the rotation and should be in contention with other tier-1 decks.