7. What do they mean for the whole Blockchain industry?

  There are various possible outcomes.

First, Bitcoin is seen as a sort of poster-boy for cryptocurrencies. Therefore, if the price of Bitcoin sees massive increases in a short space of time, irrespective if this is due to Bitcoin futures or otherwise, more people tend to take notice.

As more people become aware of the cryptocurrency industry, the uptake of altcoins will increase and push prices upwards.

The flipside is also possible; investors might want to sell their altcoins for Bitcoins in order to take part in its bullish run. Large-scale exits could cause a drastic drop in the price of alternative cryptocurrencies.

The more likely scenario is that some of the stronger altcoins, like Ethereum, Litecoin, Ripple, etc., might follow in the footsteps of Bitcoin and become tradeable as futures as well, once interest from investors become strong enough.