99% of people will use her upon release. How long they use her will be directly proportionally to how good/braindead easy she is to use. For example, the Rachel bananza died when her 2K FT and 1PP were nerfed (her two most abusable tools). Had they not been, who knows how many Rachels we would see now. Marie Rose will be similar, I think.
Mare Rose has expert holds so the noobs will want to try them/ fail them and drop her. I do believe she will be a sub for some of the better players, like Rachel.
The noobs drop Ayane (a little bit) because they couldnt do her expert holds. Quite a few noobs told me that. So why cant the Marie Rose noobs do the same? Ryu is annoying so no one cares about his veterans, noobs, newbies etc