Hi Ryan, one thing to consider is the fact that new A/V equipment is dropping the old RCA L+R connections. For instance, although my 09 "B" Samsung has them, the 2010 "C" version does not. Analog to digital (optical) switches are available, so you wouldn't be completely out of luck if you hold on to the Boston and bought a new TV.
I own last year's Polk SDA IHT, and it works like Your Boston. Analog only, the TV is the switcher, and the volume and mute is controlled by the TV remote. I love the simplicity for my bedroom setup. As you know, this type of system functions as your TV speakers without even thinking about it. If you and your wife are happy with the Boston's sound and setup, I wouldn't worry so much about other soundbars. Just sit back and enjoy.