do you know math? if you know it then asking this question is silly!
if you can't change X you can change Y and get the same or bigger M.C.
X is price and Y is the supply.
Market cap = X * Y
(MC of BTC) $138,483,107,450 = $8,155.60 * 16,980,125 BTC
(MC if SHIT) $138,483,107,450 = X * Y
if X is $10 then Y = 13,848,310,745 (13 billion coins)
if X is $1 then Y = 138,483,107,450 (138 billion coins)
if X is $0.1 then Y = 1,384,831,074,500 (1380 billion coins)
we already have at least 14 altcoins with more than 100 billion circulating coins! and at least 200 coins with more than 1 billion coins. they just have to be pumped to $10 and $1 respectively to overtake bitcoin's market cap!
the real question you should be asking is whether you should even care about it?