I see that the concern here is if Stern stops supporting SPIKE and we have to do our own repairs, but SAM was around in some form for 30ish years. Jody Dankberg's quoted thoughts from an online article:
"The old system “has a half a mile of wires, one motherboard, and everything is connected through that,” Dankberg told Ars. “It really hasn't changed very much in the last 30 years.”
The SPIKE system, on the other hand, is more modern and modular. “We've eliminated the CPUs in the back box… on the play field there's a bus system, a series of the little node boards. The intelligence is distributed through the board,” Dankberg continued, adding that all of the lighting on Wrestlemania is LED rather than fluorescent.
“Pinball is making a comeback,” Dankberg explained, saying that for a lot of people, that half mile of wires can be intimidating. A more modular system like Spike, however, is “easy to repair, easy to diagnose, [it] eliminates time to manufacture, and everything's connected through data cables that are plug in as opposed to [requiring] soldering.”
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Dankberg also said that because of the new modularity of the SPIKE system, parts will be more readily available and easier to fix. It's also scalable, so Stern plans to use the same boards to power full-color LCD displays, networked machines, diagnostic software, and even NFC systems like Apple Pay and Google Wallet."