There are already Altcoin millionaires.

I miss the days of mining Litecoin when the difficulty was 50......

That being said I think the best opportunity for anyone getting in now to become an Altcoin Millionaire would be Ripple and ZCash.

I'm also a fan of Burstcoin but that's if people really start to care and strike back hard on all the energy usage.

You really should look at percentage of growth.

If you look at the % Growth of BTC vs DOGE the past 6 months, you would've made more on DOGE.

Boggles my mind sometimes.

Basically, now I would recommend taking risks on the niche coins. To me, they are Ripple, ZCash, Burst, etc..