we should have a rule banning witnesses from submitting proposals to the DAO. This will help avoid the rich get richer problem.

I don't see a point tbh. If the proposal directly benefits the community, and if it demands a lot of work I wouldn't exclude to vote for compensation.

As you said, in this case anyone can game the system.

I like to think that witnesses have to maintain their integrity, whereby demanding a compensation for 6 lines of code would be their political suicide :)

And being top witness when hive hits 20$ will be quite lucrative deal.

So even though hive is censorship resistant, it won't be when successfully attacked. Am I missing something here

Can't we just run the old code? I doubt anyone could censor everything before the community reacts. That's the main strength of DPoS and Hive.