I'm not sure how you measure it, but I can't imagine a better park for triples than MMPUS.
I looked at ESPN's Park Factors, which measures how stats measure up at home vs. on the road. While there is some fluctuation, in an average season from '06-'09, Tropicana had a Park Factor for triples of 1.334, with 1 being neutral. MMP, on the other hand, averaged 1.108. Since it is a rate stat that compares home versus road, teams that hit more triples don't necessarily have an advantage.
We've seen what kind of player Pence is. He's a .280/25/75, mediocre defense kind of guy. If you think he's going to be the hitter that Lee is, let alone Berkman, you're in for a huge disappointment. I'm not sure why there is this continuing expectation that Pence is going to blossom into an elite player. His offense could easily be replaced by Crawford, and I suspect his defense could as well.
If Pence showed the same kind of consistency he showed when he was laying off the sliders earlier in the season, he could be a little better than that. But, until he does, he is what you say he is. Anyway, I was not implying that he could be the hitter that Lee or Berkman are, just that he has the potential to hit 30 HR. Having him as "the man" on the club scares me, which is why I'm concerned about losing Lee and Berkman in successive seasons without replacing them with another slugger.
I would not argue against Crawford's ability to replace Pence, but since the discussion has been about trading Lee next year and replacing him with Crawford, that's what I have been discussing. Without shedding Lee's salary, Crawford doesn't fit.