As browser technologies improve (WebTransport, WebGPU), Eaglercraft will likely support newer Minecraft versions. Some forks already target 1.12.2 or 1.16. The server software will evolve too — better plugin systems, database support, even cross-compatibility with vanilla clients (though unlikely due to protocol differences).
java -jar EaglercraftServer.jar
This is the elephant in the room. Is running an legal? eaglercraftserver
It is impossible to discuss Eaglercraft servers without addressing the legal and ethical implications. As browser technologies improve (WebTransport