I went to the masjid a few days before Eid to pay Zakat al-Fitr and the amount on the box said that it was 10 dollars per person. I found that to be too little, and I also found it to be disproportionate to what I make. It didn't make sense to me that a person making minimum wage should be paying the same as a person who makes a good salary or a person who makes a million dollars.
It also didn't make sense to me that we should be calculated the amount based on the cost of one saa` of dried dates, one saa` of barely or grain (a saa` صاع is four double handfuls.) People's needs are different nowadays.
The amount of Zakat al-Fitr was not mentioned in the Quran. In the hadith, the amount seems to be mentioned as a suggestion. I don't think it should be taken literally.
Ibn `Umar reported that the Prophet (PBUH), made Zakat al-Fitr compulsory on every slave, freeman, male, female, young and old among the Muslims; one saa` of dried dates or one saa` of barely. [Sahih Bukhari - Arabic/English, vol. 2, p. 339, no. 579]
Abu Sa'eed al-Khudree said, "On behalf of our young and old, free men and slaves, we used to take out during Allaah's Messenger's (PBUH) lifetime one saa` of grain, cheese or raisins". [Sahih Muslim - English transl. vol. 2, p. 469, no. 2155]
People tend to be afraid to rewrite the rules because they consider religious decrees to be sacred (even if the evidence and/or indications are flexible).
Being aware of this thinking style is necessary if we want to guarantee that religion does not stand in the way of creativity, productivity, aptness and effectiveness.