I'm in favour of having BitSilver trading.
USD, CNY, Gold, Silver & BTC
I think BitSLV should be called BitSilver if it's not already. (Or BitSIL if it needs three letters.)
'SLV' & 'GLD' are synonymous with 'Paper' Silver & gold ours are fully collateralised and will survive & thrive in a SHTF scenario whereas as SLV & GLD will be in trouble.
Edit: Looks we're already calling it BitSILVER in the client - good