Will this ever be supported again?
Probably not in the near future. From what I understand, the issue is the matter of executing python within a restricted mode interface, thus until Python supports this again, no web plugin.
Someone correct me if I’m wrong please 
it seemed to me the problems were:
- the game engine is unreasonably buggy right now [and will change a lot in the next few releases]
- there is nobody actively working on the plugin, nor on the little things of getting it signed or porting it [properly] to non-activex platforms
I also wouldn’t expect it to be supported again soon
I think there’s a bigger chance of something like a crystalspace web plugin. I’d look at compatible/exportable game engines and whether they have something along those lines.