To the last two posters, this is what I would've liked to have seen. Granted, you both have opinions about that, which is your right, but I repeat, it's what I would have liked to have seen. The Yuzhaan Vong were more original and terrifying than the retread First Order, the emotionally needy Kylo Ren, and the ill-defined Snoke (truly a phantom menace). And as the OP pondered, their question set things at the conception stage for the new Disney films, a time when all three major original trilogy cast members were alive so recasting wouldn't be an issue. Even now, I would rather they write deceased actors out of the series instead of recasting, though I am intrigued by the rumor of Meryl Streep playing Leia in Episode IX, mainly because it's Meryl Streep. If they were doing movies's set earlier in the timeline then I'm up for recasting. The fan speculation about Sebastian Stan as young Luke, I would be on board for that.
I feel that sometimes there is such a strong desire to defend the Disney films at all costs it seems that some people are looking to bat down any speculation or ideas that they view as dissent against the new sacred holy writ of Disney Star Wars; conversely some of the same folks might (hypocritically) deride fans of the original trilogy (don't know if this applies to prequel specific fans) as deifying the original trilogy. I can't speak for the OP, but I don't care for the new Star Wars, I liked the EU better than the future Disney gave us, and I have a right to voice that as much as the Disney defenders have to express themselves. I know that Disney went another route, I know that the movies (until Solo) have raked in tons of money, and I know that the new films and universe has fans, but from a 'what if' perspective, I can, do, and will continue to speculate and ponder about what could've been if the EU had been fully incorporated or more explicitly used. Every attempt to bat that down will not stop me from speculating. Besides, the EU has seeped back into the new canon regardless.