The problem with a traditional manual transmission is that it doesn't do anything well anymore (other than give people a greater sense of involvement).
It's slower around the track compared to paddle shifting variants. It gets worse gas mileage (on average) than most automatic transmissions.
It's great for people who willingly want to be slower around a track in exchange for performing unnecessary and extraneous maneuvers. It provides a "video game" feel to driving.
There seems to be a lot of outcry about the lack of manual transmission on most car forums, but the corresponding sales figures never seem to match. BMW is already scrapping the traditional manual transmission for its next M5. Developing a traditional manual transmission M5 for all of the 7 people who want it just isn't a financially sensible option anymore. It's costing them money.
Ferrari has already caught on and eliminated the traditional manual transmission from its lineup years ago.
Porsche is a little slower on the uptake, possibly because there are sufficient numbers of traditional MT enthusiasts among Porsche owners to make it financially viable.