Can you still play full parties when you search solo? If so, playing ranked without a full team is an awful idea.
Apparently full party matchmaking will be enforced.
However, it wouldn't surprise me if you still run into the issue you mentioned if not enough big parties are searching at once (i.e. a to4 is having a hard time finding another to4, so it matches a to4 against a t03 with a random).
Looking forward to getting that 50 in snipes... too bad the so called "new and improved"snipers playlist will probably be god awful and won't be worth the time :(