That's nice and all , however I suppose that BitcoinXT was the only project planning to increase the Blocksize of bitcoin (altcoin) .. now without what are we supposed to do with bigger blocks ? are Bitcoin Core developpers planning to do anything , if not there is no reason to continue using Bitcoin I suppose .. no mainstream = no future .

Where did you get the idea that Bitcoin needed to be adopted by mainstream to be successful in the first place?
Increased adoption would help Bitcoins survival into the future, the history of file sharing can be considered as a precedent for this. I would also like to see more people benefit from the Bitcoin blockchain directly, because I think this would do much good in the world.
Bitcoin is a money protocol. The internet of VALUE. It is not Facebook and therefore the number of users is not representative of its adoption.
Increased adoption by
capital is what we should be concerned about. It is not correlated with the number of users.
In that regard I shall remind you of iCEBREAKER's mention of Pareto's law of distribution. In the context of Bitcoin it means that if 20% of the world's population controlling 80% of the wealth is to adopt Bitcoin then it would bring about more success & change than if the other 80% adopted it. (The actual wealth disparity is by all account much worse)