I would conclude that no one really knows what will be in 10 years. Many things are uncertain with new gTLDs. Only this much is clear
We are headed into 5 years this February, in the beginning it was give it 3-5 years, and that is exactly what many have done.
I remember the .guru launch, people were buying the big keywords like doctor for day 1 EAP at $12,500 etc.. and there was chaos with registrations being assigned to the wrong backordered parties. People were going to develop their .guru into big things, others were going to start investment portfolios, none of this happend. Sales were good in the early days as nobody knew what was happening, or going to happen.
Radix has always been strong on pricing their renewals, Donuts let some early stuff slip thru, they have fixed those issues, and are now reserving all the good drops. As well as being under new management, I would look for them to find new revenue streams at the expense of their current customer base.
I know many people are hyped about .web, but it is really the same as .net, they mean the same thing, and we all know how good .net is doing.
There was a huge .mobi drop today, nobody cared.
Now if someone is going to take the gtld route, if keyword.direct is taken fine, they can go to keyword.solutions, or keyword.services, the people who are going to pay reg fee, will pay fee. The buyers who need the high match term most of which are held by the early EAP buyers, or the people that bought off the registry reserve list, or the underlying registry themselves are going to get that sale. The domainers who invested across the board are baiscally using their sales to recoup investment fees of losers, and the higher premium model. Some might come out more ahead with a few outliers, but for the most part it's a wash. You can't cover enough ground with a low enough annual renewal, to really get any skin in the game.