Fair enough. Looking back, I can definitely see where you're coming from. I was a bit too excited when I first read it. But, look at it from another standpoint. Why would you all want the same character to reappear in a story that isn't theirs? I probably could have phrased that better, but this is totally from curiosity. If you liked the character, then letting them have their ending, be it good or bad, is important in my opinion. It'd be like watching your favorite show reach its climax, only to have the end dragged out with an attempt at another climax.
And, last I checked, expy only had to resemble their original most, if not all, to count as one. Course, take everything I say with a grain of salt. I have no more canon information than you and will gladly admit when I'm wrong.
So, we're in the same camp. Hold on though.
While nobody but the developers can say for sure that it would, other notes from her character would lead one to believe this would actually be the case. Note her father-daughter A Support for example. Once the father tells her he loves her despite all of the comparisons to her mother, she softens considerably. If her parents were there as soon as the comparisons started, and HAD PRIOR KNOWLEDGE DUE TO KNOWING FUTURE SEVERA AND WHAT SHE WOULD PROBABLY GO THROUGH, the natural parental instinct is to reassure the child with love. Something future Severa couldn't get because her parents were dead. Her tsun tendencies sprouted because of her abandonment issues followed by her inferiority complex. I should probably cite, but the hints and such are littered across her supports. Even if younger Severa was still a tsun, there would have to be a different reason for it.
When you pull destiny into it, especially when already dealing with unknowns, it becomes hard to reach an agreement, or at least a common ground.
I would like some answers to this though. If only so I can see it from everyone else's viewpoint.
*raises an eyebrow at Carter* When in doubt, go Hoshinohri as I did