Your iPad is two years old! Okay, three if you bought it very early. AAA development on iPad is in its infancy. In another two years, there'll be games that won't run at all well on iPad 1 if at all, in exactly the same way devs dropped developing for 8bit consoles when they were too old for anyone to be interested in them because they had all upgraded. There'll come a point when the number of iPads at iPad 3 and greater power outnumber the iPad 1 + 2s by 2:1 or more, and devs will target the higher minimum spec to differentiate from the competition. Same way PC game makers no longer target a DX7 level because everyone's moved on.That's very interesting. Your example reminds me of someone that's happened to me recently.
I've just upgraded from a faulty IPad 1 to an IPad 4. There's a considerable difference in CPU and graphics power, but ive not noticed any real differences in games. Higher resolutions certainly, but that's about it.
An upgraded hardware family will mean a slower adoption of new standards, but that'll be balanced by better performance of game 3 and 4 years into a generation for those who really care to have it.