Yes, I think manufacturers will make specific one's - Especially once large brands release these to the public!
I'll be surprised if this whole idea catches on, to be honest. I think you'll see the extended seat tube for a couple of years at the most, then it'll fade away so when you see one in 5 years you'll laugh and say "remember those
And those unfortunate enough to have one will have trouble selling them on, as the only interested buyers will be slightly taller than you!
Maybe I'm wrong