Make Alignment Simple, Maintain the Necessary Evil
Should D&D Next emulate fourth edition as far as alignment goes, at least when it comes to what alignment system to use for the core rules?
I think so.
Why? Because the core rules should be simple, and what is more simple than 4th-edition's version of alignment? Unless of course, you remove alignment completely, something I’m not totally against by the way except for the fact that it also means getting rid of a lot of iconic powers that rely on alignment from past editions of D&D (like “protection from evil"). For that reason, I don't think it should be axed completely.
So there you are: alignments remain, but I think we should at least keep them simple, and that brings me back to 4th edition.
Alignment simplification and the addition of the “unaligned” designation were some of the best changes 4e brought to the table. If Wizards of the Coast wishes to offer more complicated versions from past editions, fine, but I think those systems should be made into optional add-on modules for those who prefer them, not mandated and part of the core rules. Of course, at least at present, it doesn't look like designers are taking that direction, so that means the next iteration of D&D will not likely follow my recommendation. That, to me, is a disappointment.