I don't feel like they've "gone out of their way" to do any of that. IMO there is more evidence to suggest she is Luke's than not. Just my interpretation from the information we know about TFA and the franchise. You could still, however, make a super compelling case that she will not be.
I think the script from TFA points more toward it than not.
Again, I HOPE this isn't the case because it would be interesting to see what kind of dynamics they have to work with in regard to her being "no one".
Here are my arguments that Rey isn't a Skywalker:
-My interpretation of Maz's speech is Maz tells Rey to let go of what you're waiting for, because you know it's not coming back, you're destined to do great things, go out and do them rather than wait for something you know will not come.
-It's pretty clear that Luke has always been depicted as becoming a great, clean cut Jedi, maybe moreso than any in the Republic. There's a film called Return of the Jedi, and it's stated that Luke has gone to ancient Jedi temples, presumably to study their ways. It's also known that Luke went on to form an academy for Jedi. Putting two and two together you can deduce that the likelihood is that he's trying to teach more pure Jedi in the old ways, and as such he would have to be a devout follower of the religion to be teaching it, and that would be completely within Luke's character. Being the good guy, following the old ways, a right and proper Jedi, which is what Luke has wanted since he became a Jedi. Him having a child means he wasn't actually a true follower and rather a hypocrite, which would be against Luke's character.
-If Luke wasn't a true follower, why would he now care about ending the Jedi order? Because he'd already be picking and choosing which parts of the religion he wants to follow by having a child, he could just continue to do so. and I don't think that this is a fake out, had the title not been "The Last Jedi" and Rian Johnson explaining that that's Luke then fine, but the last Jedi, will be Luke. This is another place where they could have left it ambiguous and said nothing.
-If Luke had a child, he would know about it. The force is the connection of all living things, it's established that a powerful Jedi can sense other beings and know exactly who they are. Obi Wan and Yoda could sense Darth Maul when he came back for Obi Wan. Considering Luke has been hanging out around Jedi temples and learning the ways of the force, he's likely become a lot more powerful and in tune with it and I'd imagine he's just as strong or stronger as Obi Wan or Yoda. So he would be able to sense that child.
Especially because she's force sensitive.
-Bloodline goes out of its way to ruin a completely logical explanation by explaining the timeline of the destruction of Luke's academy and the ages of Kylo and Rey. Luke had absolutely no problem enrolling his force sensitive nephew into his academy. Why wouldn't he enroll his own daughter? and you could say "Well maybe she was!" But she wasn't. Because she was already dropped off on Jakku prior to the destruction of Luke's academy. If you ignore all of the above and say "Maybe Luke dropped her off on Jakku to hide her from the first order and Kylo Ren blew up the academy and wiped her mind so even if they did find her, she wouldn't know and they'd leave her alone". But the timeline kills that theory. Which is an unnecessary detail that they didn't have to explore, and if there was going to be any logical route in my opinion, it would be that one. But they nipped that in the butt.
and again, Luke's probably been chilling with Obi Wan and Yoda force ghosts and if he ever got close to any woman I'm sure they'd tell him to chill out because that's exactly how Anakin became Darth Vader and Luke would comply because he's that kind of guy.
I just think having Luke have a child would be all kinds of stupid after they've established all of the above. They've made an effort in my mind to plug up a lot of logical options they could have taken with it. So if they do it now it'll be in my mind, ridiculous.