Philippe IV of France was famously difficult to deal with. France went to war with both England and Flanders during his reign, with his own imperious personality and dishonest actions being principle causes of these wars. In order to finance his wars, Philippe IV both destroyed the Templar Order, expelled Jews from France, and persecuted a group of Lombard merchants confiscating the wealth of all three groups while doing so. He persecuted these three groups because he owed them all more than he could repay.
Philippe IV also gained permission from the Papacy to divert Church tithe in France to the Crown purse, which resulted in a considerable increase in Crown revenue. Philippe IV managed to spend the Crown back into debt in less than two years.
Philippe's wife died in 9 years before he his own passing, and he refused to remarry. He was survived by three adult sons, two of which died within ten years of Philippe's death.
If Philippe had lived another 10 years, he would have aggravated relations with both England and Flanders, probably sparking additional wars. He also would have witnessed 2 of his three sons die, which may have encouraged him to remarry in order to produce more male heirs.
His first marriage gained the French Crown the province of Champagne, which had previously been semi-autonomous, greatly increasing the strategic and financial position of the Crown in northern France. A second marriage could have further increased the wealth and power of the Crown, and may have produced another male heir.
So, if he remarried, it is entirely possible the succession crisis sparked by the death of his third son would have been averted by the presence of an additional son. This would remove the formal justification for the Hundred Years War, but in all likelihood during his extra decade of life he would have provoked wars with both England and Flanders anyway. Since England and Flanders would be linked by the marriage of Edward III to Philippa of Hainault, war with one would likely mean war with both to some extent. Depending upon who he married, the French Crown could likely be in a strengthened financially and strategically in the run up to this war, but given his record of overspending he still would have left France in debt upon his death in 1324.
On the bright side, if he had a son by his second wife, this fourth son would have become King when the third and last historic son died in 1326. This would have prevented the disputed succession between the Valois line and the English Crown, and would have imposed a Regency upon the Crown due to the new King being less than 10 years old. This regency would be a chance for peace and financial stability for France.