Date registered: Jun 2003
Vehicle: 500SEC, ML430, SLK230, S600
Location: Houston, Texas, United States of America
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I doubt there is an easy answer to this one, but here's my take.
As you noted, your car is a 2004 model. While it's certainly not an old car, the newer integrated technologies seem to age a lot more quickly than the vehicle itself. In other words, you probably aren't using the same mobile phone you used in 2004.
dahappybanana is correct regarding the analog mobile towers. They are being systematically phased out by the various providers, and Mercedes-Benz has no control over that. One might suspect that digital towers were less pervasive in 1999, when Tele-Aid was initially phased in. It's likely that Mercedes chose analog technology to better ensure coverage in rural areas. If it were a perfect world, Mercedes-Benz would replace the units without charge on cars under warranty, and offer the replacement service at cost on those which are out of warranty.
However, in reality, the absence of Tele-Aid does not directly affect the integrity, security, or stability of your CL55, especially considering that it was really an optional (i.e., subscription) feature all along. I think most people are going to argue that you're driving a $120,000 car and can probably afford the $1,700 upgrade. Such is the life of a Mercedes owner.