After tonight she will definitely be fully on main by the end of the year if not sooner. They will probably do the same thing they are doing with Roxanne and float her back and forth until they are ready for her to go full time on main. Going to be really interesting to see if people start to prefer her over Rhea.
Rhea has the advantage of being established and being a native English speaker, but her character has pretty much stagnated and peaked atm
I really don't think native English speaker matters anymore. I saw the Iyo/Stephanie segment. Neither are native English speakers and neither are even close to fluent. It didn't matter at all. The crowd got what they were saying, they were hyped before they even locked up, and they were seemed into the whole match AND aftermath. 90% of the native English speaker also shouldn't be put in 5-10 minute promo segments. Probably the single worst hold over from the Attitude Era.
All those classic promos and angles you remember from the 80s that are still shown today were 5 minutes and under and most of the time if they were going 5 minutes or longer they involved Flair, Dusty, or Hogan. Nearly 60 years of wrestling before in ring back and forth promo battles became the thing to progress characters and angles and it stinks for almost everyone.