Keeping mine, haven't considered for a second that I would return them. I'm even happy so far with Apple Music, hadn't had any interest in it before getting the HomePod but decided to try it and now appreciate the access to music I don't already have. We'll see how long my subscription lasts, but the speakers will stay, regardless.
I am looking forward to Airplay and other software improvements, naturally. The 'stereo' capability will be very interesting to experience, given how good the sound quality of the HomePod is already. And I will really appreciate any other improvements that Apple might/will introduce in how the speakers can be controlled, how I can stream different music to different speakers and control it all from iPhone or iPad, etc.
And finally I expect to begin trying out some home automation gadgets now that I have other equipment that can take advantage of it. There are a couple of things that I can see myself adding over the next 6 months or so, step by step.