Maintaining Wives for a Year after their husband's Death: Quran 2:240, and its Effect on Islamic Inheritance.

Husbands, daughters, sisters, etc., have their shares of inheritance assigned by Quranic verses 4:11, 4:12, and 4:176.  Yet Quran 2:240, which states: "And those who are taken in death among you and leave wives behind - for their wives is a bequest: maintenance for one year (2:240) without turning [them] out," can have a profound effect, that is often ignored by Islamic Inheritance Calculators.
For example, suppose a husband with 50,000 euros in possession dies and leaves as heirs four wives and 1 son.  According to this Islamic Inheritance Calculator,   the wives each receive 3% (around 1,500 euros) each, while the son receives 88% (about 44,000 euros).  But if the Muslim husband follows Allah's commands (fearing hell-fire if he does not), then he would have stipulated perhaps in a will that each of his wives would receive a decent amount of money (say 10,000  euros) to maintain their lives for a year (and each wife would receive quite possibly even $300 more (3%) from the remaining 10,000 euros).  Consequently, the son would receive not 88% but no more than 20% (10,000 Euros).
Our Debate Question:  Do you believe that most Muslim men in places such as Afghanistan and Yemen, particularly those in polygamous marriages, are in a position to comply with Quran 2:240 & leave each of their wives enough money to survive for a full year?