CS,
Is this your interpretation or did the Rebbe, zt”l explicitly say that “anyone will be able to enter the Kodesh hakodoshim as long as they’re at that spiritual level, any day, when moshiach comes”? From Yechezkel (43:7) we see that the Third Bayis will be quite a distance removed from the city to prevent us from defiling it. People will certainly not be able to enter the Kodesh HaKadashim every day, regardless of their spiritual level.