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Why stop there. Though I find it difficult to rationalise a scenario where any of the current alts are worth their $values without this btc rally
Actually this crypto rally is driven by alts and not XBT. XBT market dominance is plunging
http://coinmarketcap.com/charts/#btc-percentage This is very different from the past.
Sure, the alts are driving the this general crypto rally/bubble, whatever you want to call it but you cant seriously think that if btc was down in double figures that we would be seeing $100 ETH, $20 ltc etc etc.
All the market share figures are showing is that the alts are outpacing btc in terms of % gains but the real world $ figures would be orders of magnitudes lower if btc wasn't so high. Imo thats undeniable.
But it can carry on being irrational for longer than you expect. Just be prepared for when it stops?