I started in the 10x30 era of shitty shaped boards - Gonz' board on Vision was the go to. I don't care how good Natas was, his shaped sucked balls. Gonz 3 and the Black Label Manny, Moe, Max shape were staples.
It wasn't until the New Deal/H-Street that shit started getting together.
Rode 6 of these in a row, more than any other stretch to date and even transitioned from football ever slick to almost Popsicle. Best deck shapes ever; I'm STILL trying to find one that matches:
Skinny boards were the logical step due to the merging of freestyle and street (and possibly the death of the mini segment and the rise of skating's popularity with kids) as kids got older and better, they stayed with skinny boards. It was a trend, just like fat pants and small wheels and big boards.
Now we're slowly going back to small wheels, and wide decks.
Also, I agree with the no-comply non-ledge dancer welcome-hipster crowd making shaped/wide boards more common. That said, Black Label hasn't made anything below an 8" in forever.
Contrary to the skating the I CAN do, I always want to go skinnier but it never works out. Wide and low always works for me.