It would be crazy not to consider the potential upside of trading Ray this year and Paul next year. Note the word 'consider' -- not pull the trigger unless it is a 'godfather offer'. As large expiring deals, trade value will be at high level for Ray -- and teams strategizing to get under the cap may come up with some surprising offers. If so, you listen. Danny's job is to play for the present, but to be cognizent of the future, optimally trying to find a way to win now and win later. If Danny can secure present AND future with the right deal(s) then he should do it.
I would be more hesitant to trade KG when his deal is expiring -- he is so unique that it would hard to imagine replacing him without completely revamping the team's identity and chemistry. As valuable as Ray and Paul are, the team's engine sits inside Garnett.