Why is "Duty Roulette" a solo feature?

[ispano]

Great point, but what if those same people who were going to que, now do not que because they don't feel it's worth it to que if they can't play together? You just effectively took the two out of the que completely.

Except those people wouldn't have solo queue'd in the first place, no? Meaning nothing changed on their part, except OTHER people will.

Say you have 100 people, who prior to 2.1, only ever went in groups. Now with the roulette, say 75 of those people refuse to use it because they can't go in a group. The other 25 however, will. So even if those 75 don't, that's still 25 more people to fill spots with.