Will the cryptocurrency market cap increase as speculated?
only those who don't understand how useless market capitalization is for cryptocurrencies speculate about it 
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What do you think will be the cause if it does increase?
it will increase and the reason is pretty simple: they keep creating tokens out of thin air. 100 billion supply of some shitcoin that is worth 1000 satoshi is increasing the total market cap by $16.5 billion dollar and they create it with click of a button. and these days shit-tokens are worth a lot more than 1000 satoshi and have a lot more supply than that.