The Cards have more experienced, well known pitchers. However, these same pitchers are either Free Agents (Mulder and Marquis) at the end of the season or reknowned "head cases" or simply inconsistant (Ponson and Weaver). They could make Reyes available in a trade. If they choose to do that, they are choosing to sacrifice their future for this season. I don't see Jocketty doing that but that is just my opinion.
This is where the Astros wealth of young pitching could pay off. The Astros have Wandy (who's not done much to improve his trade value lately), Buchholtz, Hirsh, Nieve, and a one or two further down the ladder who are highly projected. Do I endorse, encourage, or demand the Astros do something, anything, to improve their chances? No, I think they have enough players bottoming out right now that they can't help but get better. Ensberg is not as bad as he is right now. Nor is Lane, although he's not that much better. Ausmus has been scuffling for nearly 2 weeks. All 3 should improve, before the end of the season. Given Purpura's approach last year (standing pat), it's likely the approach we'll see again. Unless a deal falls into their laps that doesn't cost them too much talent.
The only risk is whether Lance, Lamb, Wilson, Burke, or someone else drops off significantly.