I fully agree with you. How can we purchase today, with full confidence, a car equiped with Medianav or r-Link if Renault stops supporting it almost as soon as it's replaced ?
And the problem is not only with Renault : I have exactly the same doubts about all other car manufacturers and other multimedia equipments (bluetooth connexion, MP3 support, 3G, ...).
The alternative to avoid this kind of problems is to purchase a Dacia with no onboard multimedia, and put second-hand devices. I'm not sure it's the best solution for Renault
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Le gras, c'est la vie