There are no dramatic singers today on the popular stages. Dramatic voices don't sit in the middle, I think that is a very easy and logical mistake that people make. People think of voice types as being linear from light to heavy, when that is not really how voice types works. Sopranos and mezzo sopranos are actually more linear, female voice are just more flexible in general, but male voices are not. First and foremost dramatic voices are huge in size, the color of the voice doesn't really matter. In many ways a dramatic tenor and a lyric baritone are actually opposite voices. The lyric baritone will have a much smaller and more flexible voice. They would be able to handle coloratura and florid passages. A lyric baritone might sound closer to a lyrical tenor. A real dramatic tenor has a huge and powerful voice. Anything that is huge is much more difficult to move around, therefore these are less flexible voices. Dramatic roles requires less flexibility so it does not tend to be a problem. Therefore thinking of these voices as being in the middle in not entirely correct. Many tenors will sing as baritones because they struggle with the passaggio, not because they really sound like a baritone. But it is more difficult in general for dramatic tenors to sing over the passaggio. Ramon Vinay is an interesting example, he was really a baritone, but obviously he did sing dramatic tenor roles for a while. When he returned to singing baritone he did not suddenly turn into a lyric baritone, he switched from dramatic tenor roles to dramatic baritone roles.
There are many problems, the obvious one is that singing should not be taught at university. Many singers that are hired today have a masters degree in singing. Imagine just how small this pool of singers really are. Not all people have the inclination and financial means to study specifically at university for years on end. Many voices are lost in the process. Most dramatic singers will not even qualify for university in first place. Professors and university types live in bubble they only appreciate artistry, I am sure there some exceptions but they are very rare. Most university types will clutch at their pearls when they hear a real dramatic voice. If you read Birgit Nilsson's biography there is one vocal coach who told her that she sounds like a foghorn and he insinuated that it would be better for her to stop singing. Young Birgit Nilsson would never qualify for the opera program at most universities.
People are taught to sing in a way which is not feasible in real life. Most singers, when they sing on a big stage for the first time says that they had to sing out far more than what they were taught in university. Basically they favor small voices.
Recordings are the other main problem. It is very easy to record small round and covered voices, and simply make them much louder. This is even done in live steaming performances these days, when you listen to the Met on demand you are not actually hearing the real vocal size of the singers, the volume is manipulated. It is easy to get away with this because only a few people will really see the performance live, while you can get thousand of views on youtube. But basically the recording problem already started in the 40's and 50's, singers recorded roles that they would never really sing on stage. It is easy to record lyrical singers in dramatic roles. The problem is people buy these recordings and they come to expect a certain sound. When they perhaps see a live performance or listen to a recording of a real dramatic voice they find it crude. You are creating a wrongful expectation for the role. Everywhere that opera is discussed you will see people asking for recommendations for studio recordings and the people always promote singers they like that are not really meant to sing to the roles. Someone would ask for a recommendation of Pagliacci and people will recommended Pavarotti, instead of someone like Mario Del Monaco who sang this role very well. They will listen to Vesti La Giubba and think Mario Del Monaco sounds crude or he doesn't sing in a nice legato line, meanwhile Canio kills two people in cold blood live on stage, this is not a character that requires a nice legato line and artistry. Opera recordings made lots of money from the turn of the 20th century until the 90's when the whole music industry collapsed. However, opera was always meant to be a live acoustic artform, it was never meant for the recording industry. All recordings today are so heavily modified they create a completely false and distorted view. I don't think people realize how much recordings are distorted.