Stealthing large ballistic missiles is a no-no. Their exhaust plume is so hot it can literally be detected from space, and that's how their launches were and are tracked by the superpowers since the '70s IIRC - via IR imaging on satellites. I suppose if you did stealth it it would make mid-course tracking more difficult but the trick is to make a stealth setup capable of withstanding the stresses. On the re-entry phase, airframe heating from air resistance is probably so high IR tracking is again invoked.
As for AAMs in general, their high speed produces airframe heating making them fairly visible on IR anyway, though their small size means they are pretty low RCS anyway. As far as I'm aware, missile warning systems are passive. It probably wouldn't change the way wars are fought at all.
However, the AGM-129, which has recently been retired, was a stealth cruise missile with an extraordinarily low RCS, mounted on the USAF's B-52s. Most cruise missiles dodge radar by flying low, at the cost of very high fuel consumption even at low speed. The -129's stealth meant it could fly nice and high, achieving a 2,000nm+ range in a missile roughly the same size as the 1,000-1,500nm TLAM. So stealth is possible but only useful in a select set of circumstances.



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