I too am a member of MBCA and read the very fine article. The conclusion I drew from that article and one data point (my Volvo going 20 years) was that a preventive R&R of all coolant carrying heater hoses would be prudent given that my spouse is the primary driver.
But I'm still looking for thoughts. Thanks to all who have replied.
S, J.R. Brown
2000 G500 LWB Obsedian Black
2005 Toyota Tacoma Access Cab Off Road Sport
1993 Volvo 240 Sedan Anthracite
1980 450SEL Champange (owned it for 15 years. Great car)
1986 280GE LWB Anthracite (Sold it and kinda wish I hadn't)