[Avodah] tzedaka priorities

[Rich, Joel]

The S"A in O"C 152:1 codifies a prohibition against tearing down a synagogue before building a new one (one must build the new one first). The M"B (4) gives the reason for this prohibition as a concern that if one had not built the new one first, a case of pidyon shvuyim(captive's redemption) might arise requiring funds to be diverted from the new construction.
1. Why couldn't the chachamim make a takana in that case?
2. Why would the chachamim work around required priorities?
3. Doesn't 152:6 says you would sell a synagogue anyway in a case of pidyon shvuyim?
KT
Joel Rich

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