I am currently trying to have 18% btc, eth and ltc for a total of 54% of the "OG's". I personally agree with you that a strong, balanced portfolio must always include btc. On another note, even if alts are falling compared to btc value, as long as you believe in what you invest in, you should be fine with the HODL untill " change of season". Anyway, thats just my B0,02. T.