I have a few miyotas in watches reps and otherwise. I find them pretty reliable and yes it should be expected to last longer than a year, but nothing guaranteed in this game. The good news is that a replacement miyota movement is much cheaper than servicing a movement. In case of failure, buy a brand new movement, install and enjoy. Alternatively an ETA could be fitted. I don't have my little cheat book to hand, but I believe a 2873 is the same dimensions and importantly stem height as the miyota.