The industry of custom long bow making is one that is deeply steeped in tradition while simultaneously being interwoven with modern innovation and engineering. It is a fascinating sector, revealing a blend of age-old skills passed down generations, and contemporary tools and ideas that have revolutionized the process. The recent increase in interest and participation in traditional archery has further contributed to this niche market's growth.

Let us begin by deciphering the pertinent term 'custom long bow'. A long bow is basically a type of bow characterized by its length which is typically equal to the height of the user, allowing for a relatively long draw. The 'custom' aspect refers to a bow specifically handcrafted according to the individual specifications of the user, such as draw weight, draw length, aesthetic preferences and the type of wood used.

In terms of the location, the industry has a global presence with notable concentrations in regions where archery is a popular hobby or sport. This includes North America, Europe, and parts of East Asia. However, the beauty of the custom aspect is that geographical boundaries are blurred with artisans able to cater to archers worldwide through online platforms.

The temporal element of this industry is intriguing. Custom long bows hark back to prehistoric times when they were used for hunting and warfare. Their relevance today is primarily recreational, with archery being pursued as a hobby, a sport, and even a mindfulness practice. Thus, the industry has evolved and adapted over millennia while staying true to the essence of bow making.

The process of crafting a custom long bow is an elaborate one. It starts with selecting the appropriate type of wood or combination of woods. Traditionally, yew was the preferred wood, but today, bowyers often work with a variety of materials including ash, maple, and exotic hardwoods. The stave is then carefully shaped into a D-profile, a process that may take many hours of meticulous whittling. The bow is then tillered, or bent, to ensure an even curve when drawn. Finally, the bow is finished with a protective layer, and the bowstring is attached.

The 'why' of the situation lies in the core value proposition of custom long bows. They offer a unique blend of functionality, aesthetics, and personal connection. Each long bow is a work of art, handcrafted to the archer's specifications. The use of traditional methods gives the bow a distinct character and story, and the personalized fit can enhance performance. Moreover, there is an emotional element; owning a custom long bow connects the archer to the rich history of archery and the lineage of bowyers.

This industry has also seen its fair share of technological interventions. Computer-aided design (CAD) programs are now used to design and perfect the bow's shape before the physical crafting begins. Composite materials like fiberglass and carbon fiber are used to enhance the bow's durability and performance. However, these technical advancements come with trade-offs. While they can improve the bow's performance characteristics, they may take away from the traditional essence and feel that many archers seek.

Speculatively speaking, the future of the custom long bow industry seems to be one of balanced co-existence between tradition and innovation. While technological advancements will continue to influence the industry, the inherent value of a handcrafted, custom bow will ensure the survival and growth of traditional methods.

The custom long bow industry is, thus, a complex tapestry of history, art, science, tradition, and modernity. It is an industry where the product is not just an object but a personalized embodiment of the archer's identity, making it a fascinating area of study and participation.