First of all, twogaab, that's not necessarily on a few points. There are so many terms for what today's "belters" are doing. It ranges from being called "mix" to "belt" to "beam" to "belt-mix" and many others. There's no REAL term for what they're doing, because they all have their own little twist on it. And NOT all of today's belters are sopranos. I may be wrong, but I don't think Idina Menzel has a legit voice. Daphne Ruben Vega doesn't. I don't know if Lillias White does. It's just way too specific to give the categorization that all high belters also have legit voices. Many do, like Eden, Heather Hedley and Shoshana, but many don't as well.
Sopranos are becoming more scarce because the style of music audiences want to see in musicals doesn't require sopranos, but belting mezzos. That's all. Cheers for Krisin doing her high stuff is just because she can do it. If she sang like that the entire show, I'm sure many people would be bored very quickly.
And while not many NEW musicals have sopranos in them, we will always need sopranos for revivals and such. Besides Chenoweth we still have Audra McDonald, Melissa Ericco, Marin Mazzie, Patti Cohenour, Kelly O'Hara, Jennifer Laura Thompson, etc. They're out there. It's not a dead species.
Eeeeeeyyyyyyyyaaaaaaaannnnnddddd aaaaaaaiiiiiiiiyyyyyyaaaaaammmmmmmm teeeeeeeelllllliiiiiinnngg yyyyooooooouuuuuuuwwwaaaahh...