There are no altcoin futures contracts and as you point in your commentary, it is unlikely that there will be any altcoin ETFs either. For these reasons I can't see an altcoin challenging BTC for the foreseeable future. Lower fees will also favour BTC over altcoins.
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The CBOT (which runs the GXBT futures) held a webcast 2 months ago in which they mentioned that they were looking to add more futures for other altcoins. Probably won't happen anytime until the CFTC sees how the bitcoin futures play out for a bit longer.