The problem with the balanced scoring is more an issue with the amount of goals we let in at the other end than where our goals come from.
Palace would love a 20+ goals a season centre forward like ours. They'd also love to have England's attacking midfielder who's got 7 goals already this season.
Point being there's maybe only '1 good game in 10' Bolasie and Cabaye I'd have in the Everton squad.
Once Baines gets back up to speed we'll have more balance to our attacks and I'm sure him and Coleman will chip in with a few from now till the end of the season.
I agree, our defense has been more of a problem, but goal scoring is not a zero sum game, and the more we score the better off we will be. Sure, there is bound to be some give and take between players, as when one player scores more, others are bound to score at a little lower rate, but it is not going to be at a 1-1 ratio. Lukaku and Barkley can still score goals, and we can get a goal every game or two from the likes of Baines, Coleman, McCarthy and Barry. Those four scored 17 between each other two seasons ago and 13 last, but have 0 so far this year. We have also only gotten 1 goal from a CB this season.
I am not in anyways suggesting that I would rather we be more like Crystal Palace on the whole, and I am not suggesting we should try to focus on getting others goals for the sake of it, but I do want to see some of the other players step up, particularly since Barkley and Lukaku are going to cool off a bit eventually. I don't have a problem with the number of goals we have scored thus far in itself.
I think you are right that others will start chipping in with greater regularity once Baines comes back into the team.