Heaven is filled up!

Paradise is full, and 54,000 Prophets have been turned away

Tabari I:323 "I asked the Messenger of Allah how many prophets there were. He replied, '124,000.' I asked him how many of those were messengers. He replied, '313, a large crowd.'"

Bukhari:V8B76N550 "I heard Allah's Apostle saying, 'From my followers there will be a crowd of 70,000 in number who will enter Paradise whose faces will glitter as the moon.'"

1) If 54,000 prophets will be turned away from heaven, what chance do Muslims who are not prophets have of reaching heaven?
a) Who were the 124,000 prophets?

2) What do Muslims say about the very limited space in heaven?
a) How do they feel that only the "weak and the humble among the people enter me [heaven]" http://muslimhadith.blogspot.com/2008/08/volume-6-book-60-number-373-narrated.html
b) Is this why Prophet Mohmmad (may peace be upon him) asks that people say (peace be upon him) every time one mentions His (may peace be upon him) name?

3) If a Muslim had the option of getting into heaven, and forcing Allah to put Mohammad (may peace be upon him) in the hllfire, would they take that opportunity considering that Mohammad (peace be unto him) did not know if he would reach heaven?

Bukhari: Volume 5, Book 58, Number 266:
Narrated 'Um al-'Ala:
An Ansari woman who gave the pledge of allegiance to the Prophet that the Ansar drew lots concerning the dwelling of the Emigrants. 'Uthman bin Maz'un was decided to dwell with them (i.e. Um al-'Ala's family), 'Uthman fell ill and I nursed him till he died, and we covered him with his clothes. Then the Prophet came to us and I (addressing the dead body) said, "O Abu As-Sa'ib, may Allah's Mercy be on you! I bear witness that Allah has honored you." On that the Prophet said, "How do you know that Allah has honored him?" I replied, "I do not know. May my father and my mother be sacrificed for you, O Allah's Apostle! But who else is worthy of it (if not 'Uthman)?" He said, "As to him, by Allah, death has overtaken him, and I hope the best for him. By Allah, though I am the Apostle of Allah, yet I do not know what Allah will do to me," By Allah, I will never assert the piety of anyone after him. That made me sad, and when I slept I saw in a dream a flowing stream for 'Uthman bin Maz'un. I went to Allah's Apostle and told him of it. He remarked, "That symbolizes his (good) deeds."

a) How about getting into heaven instead of Uthman, one of the Prophet's (PBUH) favourite companions?