I don’t want them to spend on it at all, nor do I think arenas are a best development choice. The whole arena thing is a horrible waste of resources. I wish it went away. But that’s not what the thread is about. 
Since CCP has stated their investment in cycling arena formats, meaning dev time is happening period, it’s a matter of trying to make the formats ‘least worst’. The only thing worse than 1v1 class restricted is 1v1 FFA. Please no, anything else would be better.