Visit Orlando has data showing there is a steep drop off of families visiting Orlando when the kids in the family reach 10 years old. Meaning that the preschool and elementary school demographics are well served but the tweens, teens, and young adult singles and couples demographics are underserved. All the players in the market have seen the data and are now battling it out for those families. Universal feels they can win this round of the theme park wars by offering a cooler more exciting product. It is not a coincidence that all the major players in the market are building more coasters, thrill rides, and themed bars.
Utter nonsense.
If you look at the market leaders in the game, namely Disney - they aren't actively seeking the 'teenage' or 'young adults' market. They are looking for any demographic with disposable income to entertain themselves - which usually means adults with full time employment. A teenager, or a young adult won't have this sort of disposable income to be flying around the world to Orlando, spending money in the parks, eating in the parks restaurants, buying merchandise, etc.
Ideally a park would be a cross blend to suit all demographics.
However, if you go by the succesfull Disney model. It's created for families. Grown adults, with jobs, have disposable income will bring family members - money for flights, hotels, admissions costs, restaurants, drinks, spending in the park. It's not the age, but the disposable income.
For me, this is the key demographic. It's not teenagers or young adults. I assume you use these two demographics as a metaphor for thrill seeking high adrenalin attractions.
You go further down the equation and you have local residents, tourists within America, and international tourists. Each bring their unique needs to the parks. For example, an international tourist compared to a local resident, will take up the option of staying on a Universal Hotel, buy multiple day tickets, spend money in the parks for merchandise, restaurants and more. A local resident would be unlikely to spend that sort of outlay. It's one reason why Disney push their parks so hard in Europe, especially the UK.
Your theory that the parks aren't currently servicing the teenage market is further nonsense. Firstly, not all teenagers want coasters, but yes i would accept they enjoy thrill rides. Universal will have 8 roller coasters in their two parks - that is a massive amount of thrill rides.
There is simply no need for another rollercoaster at this time from Universal, especially when they are neglecting the crucial family market.
If anything, the move for another coaster just smacks of a desperate move to address the 'screen critiscism' they have had. And secondly, the misguided judgment to put any attractions in the parks every year be it good or bad.