Maybe, but it still needs to be worded, that the standard is no magic items!
But "standard is no magic items" is utter nonsense. In no way will the standard DnD Next group have no magic items. Trying to pretend that no magic items is "standard" will just result in schizophrenic DMG language (reminiscent of 1e) and very confused newbie DMs trying to figure out why their groups have trouble in modules written under the correct assumption that magic items (and a lot of them!) are, in fact, standard.
Such a sytem could be: for every very rare magic item, add 1 extra monster. Or you could have different encounter tables appropriate for low magic/high magic-
As long as the math assumes no magic items, everything is fine!
But again, writing the math assuming no magic items, when the core play mode of DnD (kill things, take their stuff) involves "magic items, lots of them!", is dumb. Simply, irrevocably dumb. Trying to make the math flexible enough to reasonably cover "no magic items" is a reasonable (if sacrificeable) design goal. Making it the standard though involves throwing out the core play mode of DnD. The mind boggles.