Maybe one day the real Satoshi appeared and did a patent the blockchain. Is this the real purpose of Satoshi's intention to create Bitcoin?
Will Bitcoin remain valuable or vice versa? for sure Blockchain will still exist and will be a large system that will be used by many institutions and even governments.
If Satoshi wanted to profit from his invention, he would do it a long time ago already. As far as we know, he didn't sell any of his coins yet.
And I doubt that Satoshi can patent blockchain even if he wanted to. Bitcoin is open source and free software, so any products delivered from it fully belong to the creators.