Add in 1 map downthump

[MorbolvampireQueen6]

Yeah let's have a bunch of people choose not to ever be put into two dungeons that are required to get the MSQ even going. Brilliant!

Theres what 2-4 thoysand ppl on the database for the roulette a majority wouldn't use it on the same dungeon even if they did new ppl would get in at same pace if 1 new person enters game 4 others at least do on same database

[BillyKaplan]

Theres what 2-4 thoysand ppl on the database for the roulette a majority wouldn't use it on the same dungeon even if they did new ppl would get in at same pace if 1 new person enters game 4 others at least do on same database

That's really not how it's going to work.
Let's say a new dps is queueing for Sastasha and need people from the leveling roulette queue. The tank - already a rare resource - marked Sastasha as their 'ew, no' dungeon. But that tank is #1 in queue and there's also a healer. so instead of finally getting their queue to pop after about half an hour of waiting, that poor newbie dps has to stand there while the tank steals the healer and two other dps to something that isn't Sastasha.
DPS queues become even longer for dungeons that are mandatory either for MSQ or other content like GC ranks.
Will that newbie dps get in eventually? Yeah, from the mentor roulette. And there goes the Mentor who insta-bailed because they don't wanna do Sastasha, either.

tl;dr your suggestion is bad and you should feel bad, before we even get to the needless complications this would introduce to the matchmaking system. Don't wanna run those dungeons? Skip the roulette or take the penalty.

[Causality]

Theres what 2-4 thoysand ppl on the database for the roulette a majority wouldn't use it on the same dungeon even if they did new ppl would get in at same pace if 1 new person enters game 4 others at least do on same database

Speak for yourself, those are the first two dungeon's I'd pick if this became a thing, which is why its good its not a thing.