I thought the Hawkeye line was still open? Producing an upgraded C-2 seems like a good alternative, or even opening it up for some offers from manufacturers.
Maybe actually planning for the end of life replacement of an airframe shouldn't be left up to hopes and dreams. Its our broken process and broken leadership that ignores these glaring problems, and we end up with -53's indefinitely extended, subs with no replacements, CG's that are rotting from the bottom up, etc.
To me the "its better than nothing" argument is absurd. Its that line of thinking that gets us the overpriced, underperforming equipment, that arrives behind schedule, and ultimately limits our capabilities. How about minesweeping with a MH-60S? Or how about according to the Navy our new surface combatant is going to be an "upgraded" LCS that is magically going to be lighter, faster, better armed, have better armor, be reliable, oh and don't forget they think its going to cost less than current LCS. Give me a break. I hate to say this, but I agree with Sal that this is going to all catch up to us in about 5-10 more years.