I see, it exists alredy some changes of the behavior of google trends vs. bitcoin price ...
1.) The price falled in November 2018 AND the people wanted to know - Why?
2.) If the interesting falling (google trends lowers), some (big) investors trying to buy a big chunk - it results in a slowly (!!!) deflation... ((they don't want a hype!!! They are clever... They trying to regulate it... The Trustee at MtGox don't moved the remaining 165000 bitcoins to the market - so I am neutral with a little LONG of course. I investing already in ALTcoins again. Every bitcoin hype followed by an ALTcoin hype... But we have some ALT already, they are near to bitcoin: Bitcoin CASH, Bitcoin GOLD, ... AND RSK Smart Bitcoin :D But my favourites: Obyte (with DAG), Ignis, Ardor, ...))
Please see my post on the bitcoinlak also about this changes in the price analyse. I am ifinta on the bitcointalk.org since 2011. Please use my UNLICENCED ideas :) from bitcointalk.org also...
bitcointalk.org/index.php?action=profile;u=28645;sa=showPosts
I use google trends in analyse since ~2013... I published this kind of price prediction here in Nov. 2015 :)