Yes, but there's a difference between saying you want someone to carry on doing your duty after you're dead, and even meaning it, and actually coming back to find someone else wearing your clothes while everyone calls them by your name.

I actually took the letter as meaning that Steve wanted Tony not to let what he stood for die, a sort of "look after my country for me" in addition to the "look after my little brother," not that he actually wanted someone else to assume the identity and costume. I.E. something on a larger and more idealistic/intangible scale than. But then, I haven't re-read the issue since it came out, because current Captain America canon makes me physically ill to read, and also I'm boycotting purchasing it, so I'd just read through every issue once in the store really quickly, like yanking off a bandaid superfast in hopes that it would hurt less that way (it didn't work, and it eventually got so bad I finally had to give it up entirely around this September).