IMHO I think that your analysis is spot on and sound advice.
I think a lot of the ICOs in the space are poor and will eventually head to zero when they have to deliver. Also it is instructive to point out that all crypto is tech driven and the bottleneck for all cryptos is the availability of competent developers. If you were such a developer would you rather code for BTC / ETH or for some scammy and obscure alt-coin. Long term I think the risk in holding most alt-coins is off scale so in the next bull run I would look to accumulate BTC and maybe ETH and perhaps on rare ocassions trade alts short term.
Thanks for the video I now know how to describe myself .. I am a "bitcoin maximilishist" :-).