The LCD screen polarizer may eventually detach[0][1], effectively ruining the screen. Unfortunately, it's not easily replaceable. I think it's not impossible the enthusiast community will eventually come up with a solution, but until then I'd use your 48G as much as you can. After it's done, either get a Prime while they still sell on eBay or get a SwissMicro 42n for similar keyboard feel and nostalgia factor.

[0] https://www.hpmuseum.org/forum/thread-18710.html

[1] https://www.reddit.com/r/calculators/comments/1r8gtvr/hp_48g...