If I was Satoshi Nakamato, and my priority was not make quick bucks but create an ecosystem which survives and alternative to the the present money system I would allocate some funds to fund miners or the system to prove the chains.The account of Satoshi remained untouched and probably will be at that state till mining era is over.That is the way how a mathematician or strategician thinks.
About Bitcoin, yes many of the altcoins will disappear with lots of money however a bunch of cryto currencies that BTC is amongst will survive at 2040.It is not something absolute but my probability calculator system tells me 63%.The system is written by me and may be error prone so either write your own p.calculator or make decision/scnerio trees it is up to you.