I mean these people had the same feelings after hearing the EP. I seem to be the only one who doesn't feel this project has some sort of destiny attached to it.
I think what's really keeping me in it is I've worked with the frontman for 4 years and watched several projects fizzle out. He's a genuinely good guy and a talented vocalist/songwriter/guitarist. I'm pretty sure me leaving would end our friendship.
If he was a true friend, he would understand that your goals are different than those of the group. Perhaps you could assist them in finding a replacement bass player.