I've blogged about how Bitcoin cycle can overlap the Altcoin cycle. This overlap has two phases: asynchronous and synchronous. The Asynchronous is when Bitcoin can surge while the Alts get sold. Then Bitcoin can pause while the Alts rise. I believe we've completed the asyncronous overlap.
Now, Bitcoin is projected to rise to $4800 or so, per my earlier update. This time, instead of falling, the Als can perhaps rise with Bitcoin. This would be the syncronous overlap.
Just my thought experiment on Bitcoin/Altcoin cycles.