Consider this (in assault doctrine): Purely chainsword/bolt pistol armed 20-man Crusader squad does 28.5 damage to GEQ and 12.4 damage to MEQ (after shooting bolt pistols). Enough to kill most squads on the charge, assuming no losses to overwatch. Purely bolter armed 20-man Crusader squad (that shoots beforehand) does 27.0 damage to GEQ and 11.4 damage to MEQ. Those numbers are nothing to sniff at. While the close combat crusaders do a little bit more damage, you cannot always guarantee that you will have an unit to charge in a game. The bolter crusaders can hold the middle of the board and stay efficient in the game. Especially if you are using them to hold objectives. Use the BP/CCW crusaders to be aggressive and the bolter crusaders to pull up the rear...very solid core.
I will tell you what, I am extremely excited for our newest rendition codex. It looks like we are likely to get a supplement, either in the Imperial Fist supplement...or with one of our own. Let's see what the coming previews give us, but we are going in the right direction!