There is 20.5 years left. The original Elite visa's were lifetime, and transferrable. I bought it from someone who in turn bought it from the original holder. He used 5 years and sold it to me with 25 years left on it.
If you look at the current elite offerings, the 15 year is 2.5 million, the 20 year is by invitation only and is 5 million baht. Since this visa is not based on the current point scheme, you can go for a massage or play golf everyday. As an example, a local high end spa charges 2800 baht for their 1.5 hr Thai massage, and the visa holder can attend this free daily.
Elite also offers to convert this to a 15 year visa with the same perks, so once you hit the 15 year mark, you could choose to convert it, but in my opinion, you would get less perks especially if you really use the massage/golf/airport transfer a lot.
I priced it exactly like the current visa's. Pay 900K for 5 years, then 2.5 Million for another 15 years. My guess is that in 5 years, the prices of these visas will be even higher.