Is it possible to be an audiophile and be happy with what you have

The two are not mutually exclusive.  So yes.

You can argue that the most hard core audiophiles are never satisfied and have the time to continuously try to push forward towards whatever it is that they are seeking whereas some care just as much but choose a different course.  It happens.

I agree with Mapman. My family has proven it to me that one can be an audiophile and not change. For the most part they have the same gear for years and kept on enjoying music. They did acquire pieces of gear through the years here and there that they were curious about but were happy with what they have. When I tell them about the used market and how some people just cycle through gear they are amazed.

I also do not accept the OP's  premise. You can easily love music, deeply appreciate your system and pursue effective tweaks to further improve your  music listening enjoyment. 
Charles, 

I'm very happy with what I have, but I'm not audiophile.

Having recently turned 65 has changed my perspective quite a bit. Awareness of my mortality, impending eventual death, and number of hours left here to listen to music, has resulted in me letting go of the impulse to buy equipment, and to instead focus solely on the music itself. The sound of my system is good enough that I can forget about it. The suspension of disbelieve, as they say about movies.