Assuming they abandoned upgrades:
Cliq - you're stuck on Android 2.1
Cliq 2 - you're stuck with Android 2.2.
But that's the thing, you stay stuck with Android 2.2 and that's not a bad thing. Even when outdated, it will still have all the features that will keep it relevant for a longer time. This is not to mention your hardware will always be the same. You rather get stuck with a Cliq 2 than a Cliq 1.
One of the reasons why upgrades are not working on the old, slow handsets is because its getting more and more difficult to shoehorn the newer Android OS into them. Tight fit really. More powerful handsets simply got more legroom for future OS versions. It's far easier to update an HTC Desire to Froyo than it did for the HTC Hero. The question really, was a matter of engineering and logistics.