OP here, thanks for the multitude of responses! I think Levy1 gave the most succint answer, "yes you would be crazy", but I appreciate the more nuanced responses (crgildart especially). I would look ridiculous to employer and parents of students to use the dated equipment, especially with the potential for equipment failure and following safety issues. I could handle tweens and teens but I have a responsibility to be more prepared. I've found deals online and through friends (for example K2's AMP Strykers). I'll still take the old skis to perhaps give them a test run with new bindings/boots for fun, but not for work.
I would also like to clarify, when I switched over to snowboarding it wasn't exclusively but rather I didn't get on skis every year and I focused heavily on snowboarding. I've spent time on a mountain almost every year of my life, and when I was primarily a skier I was riding expert terrain regularly. Combined with years of coaching and teaching experience off the mountain is how I got the job. As a youth instructor, I will be working with beginners and munchkins, as I am uncertified (will be taking courses during season) and therefore will begin at the lowest skill levels. On a recent trip to Breck with a bunch of college buddies I was the unofficial instructor, and I had both fun and surprising success in teaching a few beginners, so I wanted to do it officially. Also, being that the last time I strapped on ski's and a board was on trip in March to Gulmarg to cut freshies in massive bowls and ridges, I'm sure I can handle the greens and groomers in Colorado, haters.
Thanks again err'body, hope its a good season in the Rockies!