Well, the server costs money. If you are able to pay for it from TOD, it is up to you if you will let it opened for the players which wants to play here.
L2 on DEX level (or more what DEX was) is business and if i was you, i will close it to save resources. So no reopen, but close.
Reopen will not help, you know it. People are going to play on different servers (tales, averia). Dex is currently loosing and needs to change something, otherweise it will die definitely, because there is more and more big and good servers.
As you can see, even if tales and averia are shits on java for you, it works. Java is actually great. You should take l2j and start to work on it, make it better so it can handle much more players, repair bugs, make it more close to official server.
The difference between Java and C++ isn't what allows PTS to handle 5k+ and Java just around 1k. The problem is l2j architecture. This is why big servers as tales and averia tooks the sources and started to develop it.
I will always return back to Dex when new server will be announced, but if i will see the world is empty, i will leave, cause no time to waste on dead server.