They recently tried phasing in silver instead of yellow last year, mostly with the membership merch, and there was outcry, the yellow camp is VERY vocal
Very vocal =/= very correct
The navy/(reddish) purple/white and gold reminds me of when they were Ribot's team, and a premiership that was won off the back of Super League's casualties. The club at the time hadn't forged it's identity yet and was at least 5 years from the beginning of their prolonged period of dominance.
Silver, while not really used during the "glory years", feels like a natural evolution of the streamlined navy/purple/white that
was used during this period. Plus it fits the theme of a gloomy storm in gloomy Melbourne.
Keep yellow for the alt and heritage designs.