I'm not going to tell my players "Well, you're all gonna die if somebody doesn't play a cleric, so one of you probably ought to do that." Nobody wants to give up their neato character concept to play the pill-rolling support character. I'm not saying that's what it has to be, only that that's what my players seem to envision. The group I'm running right now is the first one with a PC cleric in a long time. The player hadn't played since 1e, and then only briefly, and I told him to come up with a concept he wanted to play and that we'd figure out together how to make it work with the 3rd Edition rules. The concept he came back with was this:
I want to play a priest, 'cause I've never gotten to play one before, but I really want to play an elf, too. Is there a way I can play, like an elf/priest thing, somehow? He said it like it was some super-powered gestalt character. Needless to say, he's really happy with his character.
I do try to encourage the players to sit down together for character creation, and instead of building four PCs, to build one party, with all of the requisite parts. I've played in one group where we did this, and it worked out unbelievably well. They refuse to do it.
I hate the idea of taking off the kid-gloves and just killing PCs, but I'm afraid that's what's going to have to happen.
I have a favorite DMPC that I confessed to recently in another thread. I'm not the only one who feels attached to this character. I think that I'm going to have to put the PCs into a situation where a cleric could have saved them and take my DMPC along for the ride and let him get killed off because they didn't have a cleric.
Maybe first I'll send along an NPC cleric with the party as a support character and then just let them mop the floor with everything they meet. I want to make sure, though, that they get to see just how much difference the cleric makes. If the cleric's buff only gives them a +1 to attacks, I want to make sure that they consistently hit the bad guys by as small a margin as possible.
I think that I'm going to have to have the player with the cleric PC over to the house to help him pick out the best spells. They're only 2nd or 3rd level, so it shouldn't be hard, but I want to start him off right and show him how to be the party's backbone.