I'm A Banana
Potassium-Rich
Hmm, I am not sure I can agree. The system feels pretty upgradeable to me. You might not be able to rip out the power system and implant something new, but you can create new powers and new monsters relatively easy. New classes are harder, but the House Rule forum seems to indicate it is no _that_ difficult to come up with something. (Playtesting is ever the problem )
Well, true.
My main point was that 4e isn't interested in you updating your half-orc barbarian as much as it is interested in giving us sexy new tiefling warlocks as a way to cement a strong brand identity distinct from previous editions.
Someday you might be permitted a half-orc barbarian, but 4e isn't interested in updating your campaign.
That doesn't mean that it's impossible to come up with house rules that cover this, it just means that 4e, from WotC's perspective, isn't exactly in a hurry to cover this.