Making a trade to cover for Pierce being out for two weeks is pointless. No point in trading away depth you will need later in the season, especially with an older team. Wyc has already come out and said they will not pursue anybody to replace PP. TA has played well as a starter the last few years, in 13 starts over the last two years he has averaged about 12 ppg which isnt great but acceptable, and under 2 TO's a game in 31 mpg, so he seems to stay under control. He even has shot 9-20 from 3 in those games, but thats obviously a small sample.
As for Vince, he is shooting 40% from the field and if he gets knocked down early he will settle for jumpers all game, 77% of his shots this year are jumpers, thats a higher % than Ray. Now Vince is a very good shooter, but i rather make him settle for long jumpers rather than him going to the hoop. TA just needs to make him work, which he is capable of. The Celtics will be fine, it sucks that PP is out but its only two weeks.