Here is the take of the Golden State Warriors management as why they are preparing for his exit.
Warriors reportedly preparing for Klay Thompson's exit, with Lakers, Clippers and Mavericks among suitors
https://sports.yahoo.com/warriors-reportedly-preparing-for-klay-thompsons-exit-with-lakers-clippers-and-mavericks-among-suitors-214609901.html
Also.
He ain't Kevin Durant caliber although he has 4 championship rings and that's the reason why he might not get a contract that maybe he is expecting way too much.
The Lakers are said to offer him a midlevel salary and I doubt he will accept that especially if he has the pride of a champion.
Let's see how this news will end up.