Hi Mark, and welcome.
I have a Celestron CPC800, about 10 years old. The finish is as good as new. I have also used/seen older Meade's, and likewise there seems to be no problem with the paintwork. I am guessing that unless they are left in the sun all the time or hit with a hammer or a sander they will pretty much last forever. I have certainly never seen one in the flesh that looks like the image you posted. I suspect major neglect was the cause.
I must admit though I am not a fan of the new Meade paintwork. It reminds me of fingernails on a blackboard (shudder!). I like my scopes shiny!
All the best, and good luck with the decision making.
- Dean