AdSense is contextual advertising based on the websites content it appears close to. How would an algo change relate to AdSense? I guess your AdSense commissions would definitely go up or down depending on your position in Google, but it is defined by this.
What I worry is that Google promises to bring a new level of relativity. Life showed it many times that bringing something to a new level goes together with strange bugs and problems. I hope this will not affect me from this end.
I don't want a Forex web site to be reconsidered by google to kid's candies niche.
This will also not do much good to Forex adsense profits.