We can wish for all kinds of new nj connections, but it all depends on the availibility of rolling stock. Of course there are new trains, but how much extra capacity do we have? 33 new nightjets are coming within the next few years, so lets do an excersise to see how much capacity there is for extra connection. Because some need to be kept in reserve I expect that 33 trains means that there can be 12 or 13 daily connections covered with the new trains.
Of course there are already new connections from Paris and Brussels this year. paris/brussels - Berlin is added, later this year to a daily connection. So far these connections are run with two sleeper cars, instead of one for most connections with traditional stock, so (if we consider sleeping cars, not couchettes) effectively this means four extra connection are added. Making Paris/Brussels - Wien daily, both with two sleepers, means one full connection extra. So in total 5 connections will have been added with these connections by end of year.
Amsterdam - Zurich is currently running with rented stock, that is absolutely not reliable (most of the time at least one sleeper car seems to be missing). It seems likely that OBB want to replace this. You would need to sleeping cars to cover both the Basel and Zurich part. So that is two connections extra, and seven in total.
The double decker coaches might be removed from service, at least that is mentioned in this topic and I think I have read that before, but I cannot find a source. These connections are run with two sleeper cars, if they are replaced with two traditional sleeper cars that would imply four extra connections. If that is the case we are already at eleven.
With eleven extra connections covered with stock that is being freed up it seems there is a little bit of extra capacity left for new connections. However, currently nightjet seems to have some capacity issues. It is a known issue that coaches are sometimes missing, and customers getting downgraded. The NJ to Bregenz (see Vagonweb) currently misses coaches often or a sleeper car is replaced by a couchette. There is also one MUN coach from RDC in circulation, plus sometimes there is a Bahntouristik or Regiojet couchette in operation (according to VAgonweb this connection will use the new NJ from march onwards). So some of the extra capacity is likely to be used to add some extra reserve capacity to improve reliability.
If all of the above is accurate there is no room for extra connections left. Of course I am making some assumptions, so the situation might be a bit better, but there is definitely not enough capacity for all wishes that came forward in this topic. It is true that plans presented in the past inlcuded Zurich - Rome and Zurich - Barcelona, but these plans were depended on subsidy from some climate scheme in Switzerland, that did not ended up being passed. So these connections are not necessarily being planned.