Touch screens have been discussed a little on the last couple of ATP episodes and it's been interesting.
Yes, Windows sort of sucks as a touch screen as @lawrence has said, unless it's built for it (AKA iPad apps) it's pretty ordinary for full time use... but then I have a Surface Pro 3 and while I use a mouse most of the time (or the trackpad) being able to reach out and touch the screen is very convenient and somewhat second nature these days thanks to smartphones and tablets. Even if it's only for limited tasks.
My (Windows) desktop screen at home is also a 27" touch screen purchased mostly for the hard glass front panel since the kids managed to break the last one. While it's rarely used as a touch screen it's very nice to be able to point, touch, click and scroll with your finger when you're showing someone something...
... how many time have you pointed at a screen and said "click here"...
So is this one of those things, given it's pretty affordable these days should Apple simply build a touch screen into Macs and let people use them in a "build it and they will come" sort of approach?? It doesn't have to be a primary input method but it's definitely one that more and more people simply expect to be there. If I was buying a Windows laptop and a choice of touch screen or not I would be buying the one with a touch screen even few a few extra bucks.
As for hybrid, I'd love to see a MS Surface style iPad/MacBook hybrid giving you the best of both worlds. I don't really need an iPad... or can justify the cost, but then if I got one with my laptop it could be nice.
All of that said I don't think they will do it as it would build too much of a power gap between "normal" iPads and this hybrid and that's before you deal with different architecture issues. If ever, the iPad Pro was the place to do that and they chose not to.