Could the pump failing (motor) have been drawing too much current and caused the problem?

Conversely, perhaps the female connection was not as tight as normal/required and contributed to the pump's demise?

I think the first is more likely in this case though. Can't hurt sending info to BMW NA though I am not sure there is a design fault/safety issue. They should be able allay your concerns assuming they don't just respond with a "Thank you for contacting BMWNA" form letter.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)