You shouldn't be expecting a fundamental CPU architecture shift to stay backwards compatible 7 years later. Backwards compatibility costs something when you do major shifts such as these. Statistically, the amount of people who have PowerPCs have dwindled to mostly insignificant so the extra cost required to support them is not worth it. It's like asking website designers to stay compatible with IE6 or Netscape Navigator 4, it's not worth the extra work.
It's like your complaining about a countrywide shift from gasoline to ethanol and how your gas-only car engine is finding fewer and fewer gas stations to fill up with pure gasoline as the decades go by.
You'll find things that do not change fundamentally or lend themselves to relatively easy upgrades last for a very long time. Houses, simple tools, cars until they wear out, etc. Things that change and improve frequently like tech does.
It's like your complaining about a countrywide shift from gasoline to ethanol and how your gas-only car engine is finding fewer and fewer gas stations to fill up with pure gasoline as the decades go by.
You'll find things that do not change fundamentally or lend themselves to relatively easy upgrades last for a very long time. Houses, simple tools, cars until they wear out, etc. Things that change and improve frequently like tech does.