I think that attacking chances are a big luxury for Black, not only in the systems we've been discussing.  As we all know, even in the KID, there are many lines that White can play that offer Black scant chances of developing a routine attack.  The most enterprising defenses offer Black "rich play."  But they don't necessarily offer an attack.

If you MUST attack I feel sorry for you, but I would recommend you play the Stonewall Dutch and use the old method of ...Qe8, ...Qh5, ...Kh8, ...Rg8 and so forth.  Or play the Hennig-Scharra Gambit, or the Albin.  That will work well enough at the club level, but not in the league that BPaulsen and many others here play in.

Ivanchuk's line against Cheparinov certainly poses some problems, but Black can play the ...Na6 lines, or 11...Kh8, or even just straight up find an improvement, in the KID there's always room for fixing lines somewhere. 

Also, I also preferred to play against the London, Torre, Tromp, etc....when I haven't committed to ...d5 yet. I feel like it frustrates London, Torre, and Stonewallers to know that I haven't given up the e5-square yet.

Which is the problematic variation in the Mar de Plata? 
1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 O-O 5. Be2
d6 6. Nf3 e5 7. O-O Nc6 8. d5 Ne7 9. Ne1
Nd7 10. Nd3 f5 11. Bd2 Nf6 12. f3 f4 13. c5
g5 14. Rc1 Ng6 15. Nb5, maybe?
By the way, don't you think that d-pawn specials and other "anti" lines are easier to play in the Semi-Slav than in the KID?

So if the Bayonet Attack is not currently as dangerous as it used to be, why top level players who left KID (Polgar, Shirov, Gelfand...) don't play it again letting the Semi-Slav becomes a sort of standard against 1.d4 as the Sicilian is against 1e4.?
I apreciate your advices. Thanks.

I was under the impression the Bayonet has been mostly defanged, particulary in the 12...Kh8 variation (9. b4 Nh5 10. Re1 f5 11. Ng5 Nf6 12. f3 Kh8), so there's not much of a reason to hide from it. Against 13. Ne6 Radjabov's 14...Re8!? seems sufficient (14...Nc6 is also interesting, but 14...Nh5 seems to be good for white based on Cheparinov-Radjabov), and I'm not aware if white has anything after 13. Rb1.

Aside from that, both offer extremely rich play. 
 
I would consider the Semi-Slav to be ambitious, much like the KID, especially with some of the tactics that can come up in critical variations. However, I'd also say that theoretical knowledge possibly plays a bigger role in the Semi-Slav than the KID. With the KID the ideas matter more, whereas with the Semi-Slav a slight slip up comes at a higher cost.