You are talking about Krakow keeping one church open, not about them choosing which ones to close. If it were a matter of keeping one really old church open in Detroit, a case could be made that people would donate to the cause, but when it's close to 50 churches, the donations won't be flowing in.
And the parishioners are NOT there in the numbers that they were when the churches were built. You also don't have parents sending their kids to Catholic grade schools like they did in the 40's-80's, which helped to keep the parish rolls ever growing.
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