There are also valid reasons one could say "no:"
Can the gold bar in your basement be unexpectedly replaced (without your consent) with an equivalent number of XTS?
Can market forces ever decide that the gold bar in your basement isn't
worth its weight in gold?
Can you use the BitGLD in your wallet to purchase something in the event of a large-scale power blackout?
Everything depends on what you're looking for in gold and/or BitGLD. BitGLD has many many advantages over physical gold in terms of liquidity, fungibility, portability, etc., but when it comes down to brass tacks, it is not backed by physical gold.
It is backed by a promise from the BitShares X network to pay a the market value of BitGLD in XTS. If, for whatever reason (whether it be the network is maliciously attacked, or something severe happens to weaken speculators' confidence), the network stops honoring its promise, BitGLD will go the way of MtGox's Bitcoins.
If you want to take advantage of the long-term value stability (i.e., over decades) of physical gold, then BitGLD is absolutely worse
than physical gold. If you want to use gold as a medium for exchange, then BitGLD is the thing for you.