Cost of scanners over time?

How have prices and performance of 3d scanners changed over the last number of years?

I’m debating buying one for my business, but I can’t help but wonder if I’m better off doing it the old school way for a few more years and buying it later.

How fast is the technology progressing? How fast are the prices dropping?

If I spend 50k today, and I wasting my money when I could spend 20k in 2 years and have a better unit?

I’m not interested in spending 50k to get a unit today if it’s predictable that a 20k unit will blow the socks off it in a year or 2.