Oh noes. Competition!
Do you think the prevalence of silver, platinum and paladium on the PM market puts upward or downward pressure on gold? Instead of having only a "gold" market, you now have a "precious metals" market. Here, you transition from a Bitcoin market to a cryptocurrency market. It wouldn't surprise me if the rise of alt-coins actually attracts more investors than would have otherwise put their money into Bitcoins only. There are some newcomers who simply do not like Bitcoin for whatever reason, but may be lured in with an alt-coin ("this one's cheaper", "this one has