You're probably much more knowledgeable about the Templars than I am but
I understand that the Templars downfall was that they became heavily involved in Freemasonry, banking, Usury, maritime transport of material and people to and from the holy land as opposed to being a purely military order. They were incredibly useful to merchants and travelers in facilitating the safe transport of wealth in the same way that Brinks does today. Often they simply accepted a deposit from clients and issued notes that could be redeemed in gold at any Templar bank in Europe or the middle east (Essentially the first paper money). I believe the notes were in the form of coded letters that were easy for member banks to verify. In time the order became so focused on banking and business enterprises that the military component of the order went into decline. In any case they found themselves to be increasingly at odds with the Knights of Malta (Hospitallers) and The Teutonic knights.
In time the order became so wealthy that they even loaned money to royalty at interest (usury was an illegal activity at the time). Perhaps their mistake was in loaning so much to King Philip IV of France and then denying him further loans because he hadn't repaid earlier ones. I find it interesting that at the same time King Philip moved on the Templars Pope Clement V or Raymond Bertrand de Got
(the Pope that moved the administrative office of the Vatican to Avignon) began his investigation into Templar activities. That Pope Clements and King Phillip conspired to take the order down and get their hands on their wealth and perhaps even the fabled templar treasure seems to be almost assured.One history of the Templars
a modern templar?