Cases with original jurisdiction to SCOTUS are so rare that I don't think anyone can reasonably speculate to it being tossed (or heard) based on standing.
It's a relatively clean slate in state vs state case precedent. Clean enough that a majority will easily find a way to justify a desired ruling one way or the other.
It really is weird. Normally the supreme court only hears appeals, so it only rules on matters of law. It wouldn't normally rule on matters of fact, wouldn't normally call witnesses, and wouldn't normally have a jury.
It's a relatively clean slate in state vs state case precedent. Clean enough that a majority will easily find a way to justify a desired ruling one way or the other.