AT 50k I would say flush it. If you have no clue to before if any maintenance was performed, I would just to be safe here. High temps does more damage to other things here. IF you do it yourself, new fluid, burping the system, getting the temps back to normal for now. Keep a close eye on temps in the DIC, the overfill, under the car puddles, anything out of the norm after the fluid flush and refill.
IF the WP does go out, then imho. replace everything you can within budget limits. New pump, fluid, T-Stat, hoses, belts, with limited warranty too is hopefully that your good to go for the " next" 50k of usage.
Keep some replacement fluid in your trunk, during your travels. The cold weather can and does stick T-stats. Had it happen to my 3000GT. Longer warm up periods for every fluid, but the coolant here is top dog. Any and all fluids older than dirt or 10 yrs. from the factory, should be on all owners to do list. I had my read diff, fluid changed out just recently, nasty stuff. I made a short highway cruise the other day, she runs good after 6 years of ownership. I know the manual, and service for this should take place at this mileage, by the factory or dealer... you do what's best for your car now, not what the pervious owner did or did not do, or that no one has looked at your stuff except the oil change , for some time... like the factory guys. I am doing factory brakes replacement in the spring. 41k but 10 years old stuff on my car. Coolant was done last year, rear diff this year, brakes & power steering is next up on plate to do on... my car.
Might be a one time thing, maybe not. Keep an eye on it. IF nothing else happens you might be good, then again it's 50k and 10 year old fluid here..