Ultimately, the solution for HHN is the exact same as it is for modern WDW - expand capacity. Any other solution is a stopgap that will fail to address the issue and diminish the guest experience.
I've heard about the long Express lines, but I'll be honest, the night I used Express the wait wasn't any longer then what I've come to expect from past years. I attended on several other nights before 8 or after 12 and found the crowds larger then last year's, certainly, but very manageable. If a guest can only do one night and can't afford Express, then I very much sympathize with their consternation at the increased crowds - but that individual isn't going to be helped by massively increased prices. They'll just be eliminated.
Maybe FFPs are "fan service" or remnants of a departed past. But here's the thing - something that Universal does really, really well, a big reason its far more pleasant to visit them then it is to visit Disney, is fan service and creatively invoking and honoring the past, and that's nowhere more clear then at HHN. Universal is a heartless mega-corporation just like Disney, but at the moment they're doing a much better job of creating a sense that someone in management actually likes theme parks and wants to create a resort that is welcoming to guests. That builds generational loyalty, something Universal desperately needs to compete with Disney. Multi-night tickets specifically, of course, are also a great way of building loyalty and a devoted fan base. Eliminating fan-friendly ticket options or instating absurd price increases is a huge step in the wrong direction. And frankly, there's nothing wrong with a few "bargains" extended to guests here and there
I've seen what has happened to WDW over the last three decades. What was once a place I loved dearly has become a massive, impersonal, overpriced mess. I am very thankful that an improving Universal gave me a theme park resort to turn to as Disney declined. I have absolutely no idea why some fans - smart fans - want to start turning Universal into modern day Disney.