OP, I feel you about the back pain. I had a car accident about a year ago and SM hurts my back sometimes. I've learned how to brace on it. I want them to keep it classic, but smoothing it never hurt anyone. Since it went down for a major refurbishment a few years ago, I doubt unless they start having structural issues it will get replaced any time soon. It takes a long time to replace the track. IMO it's not worth it when there are methods to smooth it out. Before my accident, I used to love that bumpy feeling.
But browsing through the comments, I understand sometimes, coasters get different coaster trains from a different manufacturer for the sole of purpose of making it a smoother ride. It's more so for wooden coasters like the switch from Philadelphia Tobbagan Company coaster cars to Millenium Flyer cars, for instance. The MF trains give a much smoother ride on the wooden tracks than the old and very rough PTC cars from what I've read. I mean, I'm not really sure what coaster ride vehicle manufacturer would suit best on an Arrow Dynamics track, considering the company no longer exists and I can't recall having an Arrow Dynamics coaster ever getting a new train that I'm aware of. So maybe it's not so much the track that needs to be changed, but rather the coaster train going through the track is what is causing it to be rough. That's just my two cents.
