The electronics industry constantly turns out new models of everything, nothing is static. The good thing is newer items generally offer improved performance or reduced pricing or both, every TV/Hi Fi/DVD/CD manufacture is designing newer models ALL the time. It's the name of the game and if your happy with what you've got well there's really no need to change, the choice is yours.
Don't TM bring out new receivers?, Protek?,Dreambox? in fact tell me any company that does not do this.
I have a Leak Stereo 30+ amplifier with it's matching Trough Line tuner BUT I also have newer designed audio equipment as well, life is about trying and buying new equipment and thats what makes life fun, God knows if I'd stuck with my original Motorola mobile phone or the ZX80 I built. Life is change enjoy it.