I agree with you when it comes to the fact that all altcoins are bullish. Just look total market capitalisation. That is bullish. And look how BTC is loosing dominance.

So yes, you may invest in any alt in top 100,and have profits. I am not saying @haejin is not picking up interesting coins for profit. But it doesn't mean other coins don't grow.

Look up XRB, that thing is up 3000%+ in a month.

But what I am truly afraid of is that now there is a huge bullish market, that have risen really fast.

How much can this market rise before correction, that is more interesting question.

As @haejin had said, in the end, it is about how much fiat, not how much BTC, you have made. And that thruth may come unexpectedly out of fifth wave of total market cap uncrease like an orgasmic stream of FUD. :D