I personally think that the crypto world is evolving each day and it's going mad I mean the ads are every where I think soon it will go mainstream
I have never thought of bitcoin going mainstream and altcoins to be the supportive system. All that I used to think of is the growth and the potential it has got to get implemented in various requirements. As the technology is getting used over different needs surely it'll last longer. When there is no competence the growth will not get exposed. Altcoins do the role of giving competence through the real time usage.