Somebody could explain me? :
I believe one way or another "second layer solution" or otherwise, bitcoin will scale
Don't worry about it too much, it's just another in a long line of adam's vague and internally contradictory polls without meaningful conclusion.
The "second layer solution" means payment channels and hubs, I think. Or altcoins.
Yes, fairly vague, yet conceptually, "second layer solutions" include segregated witness, sidechains and lightning network, also... These kinds of "second layer solutions" are built on the bitcoin platform or at least while using bitcoin's platform as a springboard.
I doubt that the poll is really referring to alts, except to the extent that alts could be absorbed into bitcoin's platform in some way or as possible sidechains (using aspects of segregated witness innovations).