Why (I think) Role-Lock won't work without Role-Queue

Dont worry if they do forced 222 itll be with a role que and seperate sr for each role, jeff already stated and I quote

“Thanks for the suggestion! It’s actually one we’ve debated on the team. One concern we have is anytime we – the OW team – make assumptions about what you want to do without giving you some agency in the situation. Our concern is, we believe there are a number of players who want to or like to play different roles but because they are thinking of “the good of the team”, they flex to needed roles. A player like this, under your design suggestion, is going to end up always having to play tank or support. We really want to avoid design solutions that further reinforce players being forced to play roles they don’t intend to.”

Source: Role Queue Compromise

Basically they dont want to force players to play roles they may not want to, so judging by this information they’ll definitely have it with a role que not a straight up lock