Wacom may well decide that the competitive advantage to them having better styluses than the ones Apple can make is worth more than any amount of money Apple could offer.

Beyond the issue of whether Wacom wants to license it in the first place, even if they did, it's probably a high per unit cost (Wacom is a premium-pricing sort of company), and it's in the tablet, not the pen. What percentage of purchasers will even want the pen? I'm guessing it'll be pretty low.

Depends on software support. I remember with WinXP tablet edition, it came with 'Windows Journal', which was good enough to take all my classnotes.

Wacom may not be willing to license it.