It's pretty hard to find a good musician who is willing to pass on paid work and sit around and wait for stuff to happen. Good musicians get work.
Fixed your post for you.
Count yourself lucky he's only in ONE other band.
This.
My main gig is a 14-piece cover band, and every member of the group is involved in at least one other project. I play for that band, a vocal choir, sub for two more bands fairly regularly, sub for a couple other bands on rare occasion, and also do occasional church service and studio session work. Our keyboardist is a professional musician, so gigs are his main income... which translates to him playing in all sorts of projects. Our horn players all play all over town. Our band leader runs a complete second band (big band swing stuff), which is even bigger than ours. I think there are a total of 34 gigs among the 14 of us, give or take. This does mean that we have to sub out people sometimes (myself included), but we are a good band that works for/gets good gigs, so people are dedicated and want to be in it.
I don't disagree with either of you there, but the I think the guitarist might have come to his senses a little more if the drummer had spoken to him about it first. As I say, they're good friends...he's secretly gone and joined this band.
We don't think he'll have enough time to contribute to our band any more. I understand his reasons and they make good sense, but he's sort of killing one band that's his passion project to play for another.
I agree that the drummer could've talked with you guys about it, but he doesn't get all the blame here IMO. Sounds like you and the guitarist also have to claim responsibility here as well. This is going to sound harsh, but the drummer finding another project isn't what's going to kill your band. Not doing/accomplishing anything is what is going to (has?) killed your band. See @ArtechnikA's post above.
It takes a tremendous amount of work to get a band off the ground, especially an originals band. You have to treat it as a business if you want your band to succeed, and taking a year to finish vocals for an EP won't cut it.
5sg.

