I'm not sure how it is on other data centers, but on Crystal, alliance raid roulette has just become Crystal Tower roulette. People will strip to get a guaranteed CT run simply because they want the XP and don't want to run anything with even slightly complicated mechanics.
CT is an excellent introduction to alliance raids, but its prevalence in ally raid roulette is frankly, so bad myself and many other people I know simply do not run it anymore. MSQ roulette only has 3 (formerly 2) possible options. Doing this would bulk up the diversity of content in MSQ roulette and allow people who are queuing for alliance raids to experience something other than CT.
The only potential issue I see with this would be people abandoning Castrum/Prae/Porta in favor of CT, but people have been leaving MSQ content in favor of the other because of efficiency since before I started playing.