Jericho can come back as anything. He's amazing at everything he does, and at 40 years of age was still putting on amazing matches week in and week out.
He seems to have a head for the business and understands the need to work with younger talents, judging by him putting over the likes of Evan Bourne and John Morrison. Just let him come back and continue doing what he does best.
And another title reign would not be a bad idea.