Not a gadget guru, but I did look at a BlueTooth speaker for the same reasons as many expressed. Actually bought one and then w/o a whole lot of extra money wasn't able to easily get a transmitter for my trailer radio. So after experimenting with the wireless speaker using my cell phone I determined that it was too fragile for a campfire environment, YMMV with your choice.
Decided to return the wireless and bought a DeWalt job site radio. Simple, durable, uses mini headphone jack as alt input, built for outdoors use and works with the same DeWalt batteries as your tools. Might not hit all of your gotta have it buttons but it passed its first outing with flying colors.
2005 Dodge Ram 2500 5.9L 6 Speed
16" Michelins, Hi Spec Wheels, Max Brake, Carslile Actuator, Equal-i-zer, Dill TPMS. Campfire cook.