4 years? Yes, it will take more than that- i would think it would take more like 40! Lol that little juni he has it nothing more than a seedling, and the tree in the pic is at least 20-30 years old... These are very slow growing trees... Not like a trident or japanese maple or an elm that will throw out 5-6 feet of growth (or more sometimes) if lefty unrestricted in one season.
Cadillac, the tree you aspire to create was probably field grown for years, streaked to create a vertical growth habit and while you might get there one day from the tree you are starting with, i completely agree with dario that your time and effort is what is valuable... You can sometimes find procumbens that are sold in nurseries which are much more mature, already streaked up to grow taller, thicker... And would much more easily be trained into a style like you want. I would encourage you to look around at the big box stores in your area and the regular nurseries for some mature juniper material to work with then try to create your own tree from it. You will learn a lot more that way and speed the process up by decades..