Id say its going a little to far to the left for my taste, but I do like some of the newer Democrats. The Green New Deal is not something Im in favor of in general, but it does have some good ideas. Criminal Justice can unite the left and right. If the Dems keep going hard left on Abortion, and with stooping to Trump's level on rhetoric when it comes to opponents then I might go Independent. However, all in all Im happy with the big tentnesss of my party.
Why don't you support the Green New Deal?
Also, to answer the OP, the Democratic Party is NOT becoming extreme.