It isn’t about holding value, the cards are going to burn up. If they don’t, in 5 years one could run a rack of 4 cards at home at an affordable rate. Either the cards become affordable again and the datacenter is useless, or they don’t, and nobody can fucking afford to rent them.
GPUs definitely have higher failure rates than CPUs but I'm not sure what the absolute rates will turn out to be. If 10% of GPUs die within 5 years that's very high but also probably economically fine. If 50% die that's a disaster.
Sorry, I meant at some point the current cards in he data centers will be obsolete, financially. They’ll be sold on the secondary market. Buying 8 h200s at $150 a pop will either be a real thing, or they all burn up and capex explodes again, which would be a death knell.