The bitcoin developers are effectively against p2pool since they are against micropayments.
Yes, I'm cherry picking the quote to respond to, and the rest I will get back with you on later, but this statement simply is not fair or true.
The lowest payment on the last block was 0.00168945 BTC
i.e. 0.68% of the pool.
If the pool was 1.5PHs that's 10.2THs
Thus 1THs would be ~0.00017 BTC
As difficulty goes up, 1THs payout goes down ...
I take it you think that 1THs is too small to mine on p2pool?